Examples for my talk on structuring go apps

CREDITS SEQUENCE NEWSPAPER HEADLINE MONTAGE: HEADLINES flash before us, displaying their accompanying photographs. "UBERMAN - METRO CITY'S HERO AFTER DEFEATING MASTER MIND! PHOTO: A chiseled, statuesque man wearing the COOLEST SUPER HERO SUIT IMAGINABLE, COMPLETE WITH FLOWING CAPE, shines a confident smile at the lens. This is UBERMAN, champion of METRO CITY. "UBERMAN DEFEATS MASTER MIND'S GIANT ROBOT!" PHOTO: Wide-shot of Uberman in mid-flight lifting the GIANT ROBOT in the sky above the city buildings. "MASTER MIND ALL WET AFTER UBERMAN FOILS AQUARIUM HEIST!" PHOTO: Uberman stands knee-deep in water. He has his enemy by the collar. The villain blocks his face from the shot with a METALLIC GAUNTLET. The images start to flash by even quicker, each showing the MYSTERIOUS VILLAIN in various stages of humiliation. In each photograph he successfully blocks his face with his armored glove. We ZOOM IN to the last headline. "MASTER MIND BEHIND BARS ONCE AGAIN - THANKS TO UBERMAN!" PHOTO: Uberman stands in a gallant pose with his fists on his hips, obviously trying to accentuate the "U" insignia on his chest. END OF CREDITS SEQUENCE EXT. BUILDING - DAY We DISSOLVE from the photograph to Uberman standing in the exact same position. WE PULL BACK showing him atop a BUILDING overlooking the city below. A perfect view for our guardian hero. He watches the thriving metropolis, bristling with life as people happily go about their day. Yet, we can't help but detect a hint of sadness in Uberman's expression. 2. UBERMAN You look so peaceful from up here. His serenity is suddenly interrupted by a loud BEEPING SOUND coming from his wrist. He looks down at a BRACELET (a manly one) on his right arm. It's a silver band with a FLASHING red letter "U". UBERMAN (CONT'D) Looks like Roxanne's in trouble again. Uberman leaps off the building and into the air. His cape gracefully flows in the breeze behind him as he shoots off into the distance like a speeding bullet. EXT. OBSERVATORY HIDEOUT - ESTABLISHING SHOT Grime and moss decorate the outside of this long abandoned building overlooking the COAST. Once a place of knowledge and wonder - now home to a great evil. INT. OBSERVATORY HIDEOUT - DAY The inside is in complete contrast to the exterior. The huge hall with a GIANT TELESCOPE teems with advanced ELECTRONIC EQUIPMENT. Computers, monitors and machines which do not have an obvious function FLASH and HUM. A STEEL DOOR slides open, revealing the subject of our story MASTER MIND - a villainous sight to behold. His FACE IS INEXPLICABLY LIGHT BLUE, topped by an OVERSIZED, MUSHROOM- SHAPED HEAD with a CIRCULAR PATCH OF WHITE HAIR ON TOP. He's dressed in the kind of costume only a super villain could pull off: a PURPLE JUMPSUIT AND BLACK BOOT ENSEMBLE WITH A GIANT GREEN "M" ON THE CHEST. His right hand, hanging at his side, is a METAL GAUNTLET WITH THREE SHORT SPIKES PROTRUDING BETWEEN HIS KNUCKLES. Master Mind begins to survey the room with his TWO PERMANENTLY ARCHED EYEBROWS. A man dressed as ALBERT EINSTEIN is busy ranting to two other men. One, a hulking brute, is dressed as LEONARDO DA VINCI. The other, a small intellectual-type carrying a clip-board, is dressed as the philosopher PLATO. EINSTEIN I hate the outfits. I mean, I get it: we're all supposed to be "masterminds" - very clever. (MORE) 3. EINSTEIN(cont'd) I just feel stupid. I mean, what the hell did Einstein really do anyway? PLATO Theory of relativity. Einstein starts feverishly scratching his side. EINSTEIN Well, you'd think he'd invent a wool sweater that didn't itch so much. Da Vinci and Plato's eyes suddenly grow with concern as they see Master Mind walk up behind Einstein. Einstein notices his colleague's staring over his right shoulder and turns around. He turns around and Master Mind SEIZES HIM BY HIS THROAT with his metal gauntlet. MASTER MIND The real Einstein once said, "God does not play dice with the world." He was right, because the world is MY dice. Is that understood? DA VINCI & PLATO Sir! Yes, sir! EINSTEIN (gasping for air) Yes, sir. Master Mind undoes his grip on Einstein's throat. MASTER MIND Alright, then - clean slate. Do we have the girl? DA VINCI Yes, sir. She fell into our trap just like you knew she would. MASTER MIND Reporters are a curious lot, and easily manipulated. He quickly checks his physique in a GIANT MIRROR, adjusts his posture and sucks in his gut. 4. MASTER MIND Alright, let's not keep the lady waiting. MOMENTS LATER Da Vinci escorts a BLINDFOLDED and bound woman, ROXANNE RITCHI, to the back of the room where Plato and Einstein are standing guard over a large BLACK SWIVEL-CHAIR facing away from us. She pulls free of Da Vinci's grasp and waits for him to undo the blindfold. Her face uncovered, we finally see Roxanne's striking features - all of which seem overshadowed by piercing eyes that seem more put off by the situation than afraid of it. MASTER MIND (O.S.) Miss Ritchi, we meet again. The chair turns menacingly slow, finally revealing Master Mind. ROXANNE You didn't need to turn around like that. I can recognize the stench of failure. Master Mind unleashes a wicked laugh. MASTER MIND I trust you gentlemen know the very sassy Roxanne Ritchi, highly regarded investigative journalist who some say has a more than friendly relationship with our super powered foe Uberman. And Miss Ritchi, I trust you've already met my new crew: The Mad Geniuses! Roxanne gives Einstein a once over. ROXANNE Looks like a real group of winners. At the risk of sounding cliche', you'll never get away with this. MASTER MIND In a way, I already have. Roxanne unleashes an exhausted SIGH. 5. ROXANNE We go through this every time. You kidnap me to get to Uberman, he immediately finds your hideout, escapes whatever lame trap you've come up with, and takes you and your cronies to jail. I propose we just save everybody some heartache this time by YOU letting me go, and ME forgetting this whole thing ever happened? MASTER MIND What about my revenge? ROXANNE We can say it was wasting everyone's time. MASTER MIND You have a wicked tongue. I hope you rid yourself of that when you're my queen. Roxanne unleashes a snort-filled laugh. ROXANNE I'm sorry. What makes you think I would want to be your queen? MASTER MIND Power corrupts absolutely, Miss Ritchi. And when I have ultimate power over this city, I have absolutely every intention of corrupting you with it. PLATO Sir! Master Mind turns to Plato who's now standing at a computer terminal. MASTER MIND (annoyed) What is it!? EXT. OBSERVATORY HIDEOUT - DAY Uberman flies toward the Observatory like a rocket. 6. INT. OBSERVATORY HIDEOUT - DAY Uberman crashes through the wall to the room we were just in. He looks around, but there's suddenly NOT A SOUL IN SIGHT. CUT TO: EXT. MASTER MIND'S HYDROFOIL - DAY The boat is shooting through the ocean, away from the observatory. INT. HYDROFOIL CONTROL ROOM - DAY Machines, cables and terminals criss-cross the craft's main bridge. Through the enormous surrounding windows we can see the observatory shrinking in the distance. Master Mind watches Uberman on a small TV monitor as the hero intently searches his hideout. UBERMAN (on monitor) Master Mind! INT. OBSERVATORY HIDEOUT - DAY Uberman throws up his arms in frustration when suddenly - MASTER MIND (O.S.) Over here, old friend. He turns to see a FAMILIAR BLUE FACE OF EVIL ON A GIANT SCREEN. UBERMAN What's the matter, miss your old jail cell? Uberman starts walking toward the monitor. MASTER MIND (ON MONITOR) Actually, I wanted to share the experience with my oldest friend. A MECHANIZED CAGE shoots out of the floor, suddenly trapping Metro City's protector. Totally unfazed, our hero stares on. 7. UBERMAN You can't possibly believe this will work. Master Mind pulls out a SMALL BLACK BOX with a SINGLE RED BUTTON on it. MASTER MIND (ON MONITOR) Oh, can't I? I have attained control of the Earth's most abundant energy source. I doubt even you are strong enough to withstand the FULL CONCENTRATED POWER OF THE SUN!!! He presses the button. EXT. OUTER SPACE A sinister-looking SATELLITE orbits Earth's atmosphere. Its bay doors suddenly open, deploying two huge SOLAR PANELS. The panels shift, angling themselves in the direction of the sun. They immediately start GLOWING as they absorb the burning star's power. The front of the satellite begins to make a loud HUMMING SOUND as it prepares to unleash its unholy power. INT. HYDROFOIL CONTROL ROOM - DAY From the giant window we can see the boat is a good mile from the observatory. PLATO We're now at minimum safe distance, master. Master Mind turns from the CAMERA he was broadcasting on and puts down the control box. MASTER MIND Excellent. Stop here, I like this view. PLATO Twenty seconds until impact. Master Mind turns to Roxanne who is being held by Da Vinci and Einstein. She almost appears a little bored. Disappointed by her lack of horror, he walks over to the monitor now showing Uberman trapped in the cage. 8. MASTER MIND Any last words? Uberman looks up at the screen with a cocky smile. UBERMAN (ON MONITOR) Yes: there's no caging the power of justice. PLATO Ten seconds to impact. On the screen we see Uberman take two of the cage's bars in his hands. He yanks...NOTHING. PLATO (CONT'D) Nine... Master Mind stares at the monitor, slightly confused. PLATO (CONT'D) Eight... Uberman yanks on the bars again, this time using his foot as leverage. MASTER MIND (genuinely concerned) What's going on? UBERMAN (straining) Hold...on...a second. Master Mind looks back at Plato and Einstein. They're equally befuddled at the hero's sudden weakness. PLATO Seven... Uberman loses his grip and FALLS BACKWARD ON HIS ASS. UBERMAN SON OF A BITCH!! Master Mind and the minions all cringe in unison. Da Vinci turns to Roxanne not believing his ears. DA VINCI What did he just say? 9. PLATO Six......Five... Master Mind begins to laugh. MASTER MIND What kind of trick is this? Uberman looks up at the camera with a very grave expression. UBERMAN Like you don't know. These bars are made of copper, aren't they? PLATO Four... MASTER MIND Yeah, so? Uberman tries to shield his grief with his hand. UBERMAN You figured out my weakness, damn you. I CAN'T BEND COPPER! PLATO Three... MASTER MIND Your weakness is copper? PLATO Two...one. Everyone turns to the window. EXT. OUTER SPACE The satellite fires a giant BEAM OF LIGHT toward the earth. EXT. OBSERVATORY HIDEOUT - DAY The beam hits the observatory. The building instantly EXPLODES in a white nova blast of fire. INT. HYDROFOIL CONTROL ROOM - DAY The blast is so bright everyone turns away from the window. Then, as suddenly as it began, the awesome light dies out. One by one, the passengers unshield their eyes and look out toward the observatory. 10. All we can see through the haze of destruction is fire and smoke. PLATO I don't think even he could have survived that. Einstein suddenly turns giddy with excitement. EINSTEIN Whoa! Is it me or did you just finally destroy Uberman? MASTER MIND (carefully skeptical) Well...let's not get ahead of ourselves. Da Vinci suddenly sees something outside. DA VINCI Look, there's something in the sky, coming this way. ROXANNE Uberman! Master Mind turns toward the window. An object is in the air, flying directly toward them. As it closes in we can just make out the FAMILIAR OUTLINE OF A CAPPED FIGURE. MASTER MIND I KNEW IT! PREPARE YOURSELVES! HE'S GONNA RAM US!!! Everyone scatters and braces themselves for the impact. Master Mind, seeing all the good places taken, doesn't know what to do with himself. He just covers his giant head with his hands. The figure CRASHES THROUGH THE WINDOW and lands at his feet. He looks down to see a CHARRED BLACK HUMAN SKELETON. Around its neck is the unmistakable black cape of Uberman. MASTER MIND (CONT'D) (horrified) HOLY SHIT! 11. Roxanne breaks out of Da Vinci's hold and runs over to the body. ROXANNE Uberman? She stares down at the still smoking corpse, the tattered black cape with the yellow "U" on it. Roxanne turns to Master Mind, who's still visibly dumbfounded at the grotesque sight before him. ROXANNE (CONT'D) You killed him! Roxanne's eyes roll back. Da Vinci catches her from behind as she FAINTS. Einstein turns to Master Mind, looking at him as if he's just walked on water. EINSTEIN You did it! Now that he's committed the impossible - our villain is at a complete loss. MASTER MIND ...so I did. EINSTEIN I mean, I know you always wanted to. I mean, all the schemes all the plots - I never thought you'd actually be capable of it. Giddy as a school girl, Einstein turns to his fellow henchmen. EINSTEIN This is history. Every villain and lackey in the history of villains and lackeys dream of this moment, but when does it actually EVER happen? A sudden realization comes over his face. EINSTEIN Good lord...You do all realize what we get to do now, don't you? 12. His question is met with acquisitive looks from Master Mind and the others. EINSTEIN We get to go on a crime wave. CRIME WAVE MONTAGE - SET TO "Fun Fun Fun" by The Beach Boys. SPINNING HEADLINE: "UBERMAN'S DEATH IGNITES CITY WIDE CRIME WAVE!" ARMORED TRUCK It's driving along when the men inside suddenly notice something - THEY'RE FLYING HIGH ABOVE THE CITY STREETS. We PULL BACK to see the truck being carried by a giant claw at the bottom of a BRAIN COPTER. Inside the cockpit Master Mind and his henchmen laugh maniacally. SPINNING HEADLINE: "CHAMPION-LESS CITY AT THE MERCY OF HOOLIGANS." METRO CITY BANK Da Vinci and Einstein run out the front of the bank holding BAGS OF MONEY. Two beat officers see them and take chase after them around the corner and into an alley. After a moment the police reemerge from the alley screaming and running for their lives as a GIANT ROBOT CHASES after them. The robot stops, then suddenly it's head opens up like convertible car top with Master Mind and Plato at the driver's wheel. They smile and shake hands at a bad deed well done. SPINNING HEADLINE: "MASTER MIND BLACKMAILS METRO!!!" A VICIOUS TORNADO It's heading for downtown Metro as Master Mind and the lackeys coolly look on. Three large DUMP TRUCKS pull up, filled to the brim with bricks of CASH. 13. The DRIVERS jump out as the lackeys take the driver seats in the three trucks. Master Mind is about to climb into the passenger seat of one when a drivers taps him on the shoulder and motions toward the tornado. MASTER MIND (absentmindedly) Oh, right. Master Mind pulls a television REMOTE from his pocket and aims it at approaching windstorm of death. He presses the button marked "Tornado Off." The tornado shrinks and disappears just before it hits the city. As they drive through the city streets, Master stares out the window with a hint of something in his eyes. Is it melancholy? END OF MONTAGE EXT. KINGPIN BOWLING - DAY It's Metro City's premier bowling alley. On top of the neon lit building is a GIANT 30 FOOT TALL CEMENT BOWLING BALL. INT. KINGPIN BOWLING - DAY HAL STEWART (early 30's) takes careful aim with his BOWLING BALL. HAL It's a sport of honor, focus and grace. Honor the ball, focus on the pins, release the ball not hard and fast, but as if you were releasing a baby dove. He takes a step, pulls back his arm, and releases the ball, following it with his eyes. It's a horrible shot - INSTANT GUTTER BALL. An aged barmaid type with a cigarette hanging from her mouth looks over at him. HAL Okay, do something like that - but center it more. 14. She picks up her custom made FOGHAT BALL and takes aim. ATTRACTIVE BLOND Tell me how my form looks, honey. Hal focuses on the misshapen bumps of her enormous Johnson administration era derriere. HAL Oh, it's lookin' good. It's lookin' REAL good. It doesn't get anymore clear. This man is a pig. VINNIE (O.S.) Hal, I want to see you in my office! Hal turns to see VINNIE, owner of the bowling alley, calling him. VINNIE Now! INT. KINGPIN BOWLING - VINNIE'S OFFICE - MOMENTS LATER Hal sits down, facing Vinnie who's sitting at his desk. VINNIE You're fired. Leave your shirt and locker key. This bit of news hits Hal like a freight train. HAL Fired? Are you going to tell me why? VINNIE Showing up to work late. Showing up to work late drunk. Sexually harassing customers. Stealing from the register. HAL Vinnie, I don't know where you're getting these accusations - Vinnie takes out a video tape from his desk drawer and puts in a VCR. 15. HAL Oh, which one do you supposedly have here? VINNIE This is all of them at once. TELEVISION A WOMAN walks up to a BOWLING EMPLOYEE and hands him a pair of shoes. As the employee turns to the wall of shoes, a very drunk and disheveled Hal comes running in and pushes him aside. HAL I've got this one, Benny. So, Cinderella. Can I help you find your glass slipper? WOMAN Yeah, I'm looking for a seven. He folds his arms on the counter and leans into her with a cat-like grin on his face. HAL (with a leer) Seven - Well, maybe I could interest you in something in an EIGHT. Namely, me. Disgusted, she walks off screen. HAL Lesbo. Suddenly realizing the register's open, he quickly grabs a stack of cash and shoves it in his pocket. BACK TO OFFICE Vinnie turns off the television and waits for Hal to respond. HAL From the angle of the camera, I can see where you might have gotten the wrong idea. Listen, Vinnie, I don't think you've thought this through. If you fire me, who's gonna be captain of the alley's bowling team? 16. VINNIE Um, I don't know. Maybe somebody who can actually bowl. You guys have never won a game. I hired you because you said you were on the pro circuit. HAL No, I said I WILL BE on the pro circuit. VINNIE Please, a loser like you will never amount to anything. This harsh remark seems to leave Hal genuinely stunned. HAL Wow...If that's how you feel...I guess we should then talk about what kind of severance I'm gonna get. EXT. KINGPIN BOWLING - DAY TWO BRUISERS open the door and throw Hal out onto the street. He quickly picks himself up and turns back toward the building. HAL Hey...what about my ball? A bowling ball sails past him, just missing his head. HAL Thank-you! EXT. CHANNEL 7 NEWS BUILDING - DAY The massive building with a giant 7 on the roof stands in the heart of Metro City. INT. CHANNEL 7 NEWS BUILDING - OFFICE - DAY The cubicles and offices are alive with the hustle and bustle of a busy news day. Phones are RINGING, REPORTERS are TALKING, and Editors are SHOUTING. The elevator doors open and out steps Roxanne Ritchi. 17. Everything stops as the entire office suddenly falls SILENT. Somewhat taken aback by the reaction, Roxanne scans the room to see every eye on her. ROXANNE It's...um...It's good to be back. Thanks for everyone's cards and concerns. I really appreciated it - now I'm ready to climb back on the horse. No one is budging - their looks of pity are really starting to make her uncomfortable. The back office door suddenly opens and out comes FRANK BONIN, the gruff, middle-aged Producer of Channel 7 News. Noticing the silence, he looks up and sees the sad expressions on everybody's face. FRANK Someone die or something? He suddenly notices Roxanne - both feet are placed firmly in his mouth. FRANK (cursing himself) Oh, Jesus. ROXANNE It's okay. Frank quickly walks up to Roxanne and takes her gently by the arm. FRANK Come on into my office, sweetie. INT. CHANNEL 7 NEWS BUILDING - FRANK'S OFFICE - CONTINUOUS He sits her down on his leather couch, then quickly turns toward his door. FRANK Can we get this woman some water for God's sake? (to Rebecca) I gave you two months off. What're you doing back? People are gonna think I'm a slave driver. 18. ROXANNE Aren't you? FRANK Yeah, but I don't want people to think it. ROXANNE Frank, listen. I want to go back to work. I NEED to go back to work. FRANK ...You're hysterical, aren't you? Frank sits down on the couch and blankets Roxanne with A WARM EMBRACE. ROXANNE What're you doing? FRANK Keeping you warm before you go into shock. (toward the open door) DO I HAVE SLICE OPEN A CAMEL HUMP TO GET A GLASS OF WATER AROUND HERE? A SECRETARY quickly enters with a bottled water. She sets it on the table in front of them and leaves. Roxanne pulls herself out of Frank's grasp and stands up to face him. ROXANNE It was a traumatic experience. Yes, everyone knows Uberman and me were...close. But what I really need - what would really make me better is getting back to work. There's a sudden awkward silence from Frank. FRANK Well, that's going to be... ROXANNE I thought you'd be happy to have me back. 19. FRANK Oh, we are. Honey, nothing makes us happier than to have our girl back, but... ROXANNE Yes? FRANK Things have sorta...changed. ROXANNE In three weeks? FRANK Listen, I'm not one who likes to open up wounds - especially ones that are just starting to scab, but you were sorta our go to girl for the exclusive on Uberman. And now that he's gone...I moved Brad into your anchor spot. ROXANNE (disgusted) Brad? Brad Helms? The man is an idiot. FRANK It's the suits. They think it's time to switch things up. ROXANNE Oh, because they can't use me to get the big story. FRANK C'mon, Roxie. Using is in the nature of what we do. They used you, you used Uberman. Everybody's happy. ROXANNE (defensive) I didn't use him. FRANK Oh, I didn't mean that. I know you two were in love or something. My bad. ROXANNE We were. 20. FRANK And that's great. ROXANNE Very in love. There's a hind of self-doubt in Roxanne's expression, as if she's failed to convince even herself of this. ROXANNE Okay. So, where are they going to move me if Brad has my spot? FRANK ...Human interest. ROXANNE Bake sales and pet stories. FRANK I told them I wouldn't be surprised if you just upped and quit. You busted your ass for that desk. Roxanne can hardly get it out - she's busy swallowing her pride ROXANNE I'll take it. Frank looks up at her, not believing what he's hearing. FRANK What? EXT. ABANDONED METRO CITY LIBRARY - NIGHT Amongst the jungle of high rises, one small building stands out from the rest - A tiny, forgotten piece of 19th century Gothic architecture. LIGHTENING FLASHES, revealing TWO CONCRETE GARGOYLES holding a cracked plaque, reading: METRO CITY LIBRARY. INT. ABANDONED METRO CITY LIBRARY - NIGHT A mixture of old and new. Dusty Victorian furniture and dilapidated bookshelves sit side by side with pristinely futuristic machinery. The building has been converted into Master Mind's new SECRET LAIR. 21. In the center of the main room is a three storey tall GLOWING BLUE ORB. At the base of it is a sign that reads "Reactor - Don't Touch." We PAN OVER to the READING ROOM where Master Mind is sitting on a couch watching TELEVISION. REPORTER ON TELEVISION (O.S.) It's been nearly six weeks, and still no word on the whereabouts of billionaire playboy, and philanthropist, Wayne Scott. Tune in at 11:00 as we look into what has become Metro City's biggest mystery. TELEVISION NARRATOR (O.S.) We now return to "The Hero of our Hearts: The Uberman story." Einstein and Plato come into the room holding a BAG OF LOOT. EINSTEIN Just robbed the diamond exchange. MASTER MIND (feigning pleasure) Great, great. Put it on the pile. Einstein tosses it on a LARGE PILE of purloined valuables in the corner of the room. EINSTEIN Anything else today? MASTER MIND No. Master Mind turns his attention back to the screen. Plato sees that Master Mind is in a funk and tries to snap him out of it. PLATO (cheerfully) Sir, the new reactor is installed. Plato nods to the giant orb. PLATO Do you want to throw the switch? I know how you love to start reactors. 22. MASTER MIND Maybe later. Einstein gives Master Mind a funny look then exchanges glances with Plato before leaving the two of them alone. Without turning away from the TV, Master Mind addresses Plato. MASTER MIND (CONT'D) What is it, Plato? PLATO (nervously) Sir, I can't help but notice that you've been...a little down lately. MASTER MIND When I want your opinion I'll beat it out of you. PLATO Yes, sir, I know, but please forgive my impertinence. It's just that you seem to have lost your lust for our profession. You've stopped going on jobs and spend most of your time watching Uberman specials. Master Mind relaxes slightly and turns to face the window in a classically contemplative pose. After an overdramatic beat... MASTER MIND I have defeated my greatest enemy. I have free reign over Metro City. I have more wealth than a thousand Sultans. I've achieved all I have worked for...so why am I so unhappy? He walks over to a PAINTED PORTRAIT that looks almost exactly like him, except slightly older, maybe meaner - MASTER MIND'S FATHER. MASTER MIND I mean, my father, god rest his evil and tormented soul, raised me straight from the test tube to be a symbol of evil. (MORE) 23. MASTER MIND(cont'd) And, I have accomplished something he had only dreamed about - the destruction of Metro City's champion. I tell you, I've always lived with this unquenchable thirst. I thought it was to make him proud or to get absolute power. But now that I've pretty much accomplished both, I am at a loss. PLATO ...I sort of have a theory about all that. MASTER MIND (snippy) Oh, really? PLATO Well, for one thing, maybe Uberman was more important to you than you thought. MASTER MIND He was a worthy rival. Sometimes I wonder, did he consider me his evil equal or was I just an annoying, little gnat to him? ...What's the second part? PLATO I think you sort of have a thing for Roxanne Ritchi. Master Mind quickly takes his lackey by the throat. MASTER MIND YOU WORM! HOW DARE YOU! WHERE WOULD YOU GET SUCH A NOTION? PLATO Sir, your plans always involve Ms. Ritchi either being kidnapped or placed in danger. If that's not love, I don't know what is. It's the grown up equivalent of dipping her pigtails in the ink well. Don't you see? She's the one treasure that's always escaped you. From Master Mind's expression, we see Plato's words beginning to ring true. 24. INT. RESTURAUNT - DAY Roxanne is having lunch with several girlfriends sitting around her, gabbing. FRIEND #1 I can't believe you came back so soon. FRIEND #2 Are you sure it's not TOO SOON, honey? ROXANNE I just wanted to get back to work. FRIEND #3 What we need to do is get you back on the saddle...the love saddle. Friend 1 and 2 give 3 disapproving looks. FRIEND #3 It's been three weeks. FRIEND #2 She just lost the love of her life, Grace. A WAITER comes by with a tray of CAESAR SALADS and begins setting them out for the ladies. ROXANNE I keep trying to tell people it wasn't really like that. Uberman and I - We were kinda having problems. We broke up. The waiter ALMOST DROPS HIS TRAY AT THIS. The women are too shocked by Roxanne's revelation to notice. FRIEND #1 You broke up with Uberman! FRIEND #3 You must have REALLY, REALLY high standards. I mean, you were dating a god. I mean, what's it take? ROXANNE Maybe someone who's a little more aware of his faults. Someone a little more sensitive. 25. FRIEND #3 Right. Someone who listens, sexy but attainable with cute little cheeks like a hamster and heartbreak in his eyes. She turns to Friend one and two to explain. FRIEND #3 She wants John Cusack. FRIEND #2 The actor? FRIEND #3 No, the famous pediatrist - Yes, the actor. Ever since we were teenagers, Roxanne's totally had the hots for him. ROXANNE Well, until he miraculously comes walking into my life, I'm just going to take a little reflection time for myself. The waiter gets a confused look on his face then slips away as Roxanne and her friends continue to chat away. EXT. RESTURAUNT - DAY The waiter tosses his apron in a trash can, then rolls up his sleeve and presses A STRANGE LOOKING DEVICE STRAPPED TO HIS WRIST. His image gets staticy, like a TV station going out, then disappears - revealing the man's true form underneath: MASTER MIND! MASTER MIND Who the hell is John Cusack? EXT. CITY STREET - DAY A YOUNG MOTHER pushes her baby stroller past a building construction site. ACROSS THE STREET A local POLITICIAN addresses a group of REPORTERS on the sidewalk, including Roxanne. 26. POLITICIAN The Fifth Avenue Renovation Project, which I championed, will breath new life into the downtown area. New life means new jobs and new revenue. ROXANNE Councilman, is it true that your brother-in-law's construction company won the contract for this project? POLITICIAN Well...er...yes, but...look I'm not here to answer a lot of crazy questions... YOUNG MOTHER The young mother stops halfway down the block, reaches into the stroller and tries to comfort her now crying baby. Above her, a CRANE is maneuvering a pile of STEEL GIRDERS to an upper floor. Hal comes around the corner and heads in her direction. CRANE The crane GRINDS TO A HALT. The OPERATOR has a confused look on his face as he moves levers back and forth in an effort to fix the problem. Hal stops a few feet from the woman and stoops down to tie his shoe. CRANE The operator's hand slips off the lever, hitting a RED BUTTON. To his horror the crane DROPS ITS LOAD OF STEEL. HAL AND THE WOMAN The woman looks up to see the girders seconds from crushing her and her baby. She screams. Hal looks up and sees it as well. He starts to run out of the way and crashes into the woman and stroller. ACROSS THE STREET 27. The reporters turns their cameras just in time to catch on film what appears to be Hal pushing the woman to safety just as the GIRDERS CRASH TO THE GROUND. HAL AND MOTHER Tears of joy in her eyes, the woman picks up her baby and kisses it. Hal struggles to catch his breath as the mother turns to him. YOUNG MOTHER Thank you! Thank you for saving me and my baby! She hugs him with her free arm, weeping with joy. HAL (not knowing what she's talking about) Huh? He's a little uncomfortable with the woman's public display of affection and the small child in-between their embrace. HAL (CONT'D) There, there. Hal slowly eases out of the woman's grip. HAL (CONT'D) Okay, we better...well, I hear these little guys smother easy. The reporters rush over and surround Hal and the mother. ROXANNE What's it feel like to be a hero? Hal looks up at Roxanne. Instantly, he's captivated by her beauty. HAL Well...I'm just a man doing what men do. You're Roxanne Ritchi, aren't you? They're suddenly interrupted when another reporter pushes his way in between them. REPORTER Were you scared? 28. HAL Scared? Who had time? The reporters eat this up. INT. ABANDONED METRO CITY LIBRARY - NIGHT TELEVISION John Cusack stands in the rain looking up at a window of a two story house. He holds up a BOOMBOX and "In Your Eyes" by Peter Gabriel begins to play. From the couch, Master Mind and his minions watch. MASTER MIND John Cusack, huh? So all I have to do is have a cute puppy dog stare, be willing to make a fool of myself and - Oh, REMOVE BOTH MY BALLS. He turns to see Da Vinci watching the movie and wiping a tear from his cheek. MASTER MIND Please, get a hold of yourself. INT. BOOKSTORE - NIGHT Roxanne is carrying a large paper coffee cup in her hands as she peruses the isles. She sets it down on a shelf to pull a book out and ends up KNOCKING THE DRINK OVER. ROXANNE Shit. She goes to pick it up when someone bends down and picks it up for her. Looking up to thank him, Roxanne is suddenly stunned speechless - It's popular and critically acclaimed actor JOHN CUSACK, or rather Master Mind disguised as him. "JOHN CUSACK" Oh the humanity - it was a Venti. ROXANNE (stunned) You're...you're. "JOHN CUSACK" Yes, it's me. John Cusack...the actor. 29. He notices the book she's reading. "JOHN CUSACK" Hey, is that Shelly? Wait, I think remember something from that one - Let's see: "My head is screaming `I want you and need you' - my heart it keeps reaching to see you and feel you - yet in the end, I'm alone once again." Wow, I scare even myself. I'm sorry. I'm just really into poetry. Probably because I'm so sensitive and always going to great lengths to express myself. But enough about me. Can I fill you up? ROXANNE (captivated) ...Yes. (catching herself) I mean, excuse me? "JOHN CUSACK" Can I fill you up? Your coffee. ROXANNE Right. INT. BOOKSTORE CAFE' - LATER Roxanne talks as John Cusack listens to her every word intently. ROXANNE I did have a boyfriend - until fairly recently. She suddenly begins to feel the stares around her as passers- by being to notice who she's with. ROXANNE I'm sorry - this is so surreal! "JOHN CUSACK" Yeah, they charge way too much at these places - Now back to your boyfriend. I'm interested and compassionate. I want to know about you. 30. ROXANNE Things were complicated. He was a man married to his work. There was...there was a lot of competition in his line of business. I'm sure you know what that's like. "JOHN CUSACK" Sure. In my business, one thing I have is RIVALS. For example, mine is...uh...Lou Ferr...igno. ROXANNE ...The body-builder who used to play The Hulk on TV? "JOHN CUSACK" Did he? Well, we're always up for the same roles. Did your boyfriend have someone like that? A particular rival that was always getting his goat - so to speak? ROXANNE Well...one rival in particular seemed to get more of his attention than I ever did. But enough about my problems. "JOHN CUSACK" NO, TELL ME MORE!!! Suddenly realizing his outburst, he begins COUGHING to mask it. "JOHN CUSACK" (CONT'D) I'm sorry. I got a whooping cough. Had it ever since Serendipity. I WONDER WHERE OUR REFILLS ARE!!! (fakes cough) See, there it goes again. Please, go on. ROXANNE Right, well, he seemed to need him more than he needed me. "JOHN CUSACK" How do you mean? 31. ROXANNE It was conflict he thrived on. He always said he wouldn't know what to do with himself if Master - I mean, this guy were gone. It was like he needed it, like oxygen. The answer to his mental funk hits him like a bolt of lightening. He turns away from her as if for private time. "JOHN CUSACK" (almost to himself) I think I finally understand...The only logical answer is to recreate that rivalry - or if that's impossible, create one of equal structure. That's it! ROXANNE What? John Cusack snaps out of his dream-like haze realizing she's heard every word. "JOHN CUSACK" Oh, sorry, sorry. Just rehearsing for a part...where I play a man who talks to himself at inappropriate times. In a sudden rush, he rises out of his chair. "JOHN CUSACK" I have to go right now, but I'd really like to see you again - if that's alright. Roxanne looks up at him - She can't help but laugh at the craziness of the situation. ROXANNE I'd love that. INT. ABANDONED METRO CITY LIBRARY - DAY Master storms in the office to find Plato and Einstein playing darts with the original Mona Lisa. EINSTEIN Got her nose! MASTER MIND I've got it! 32. Everyone stops what they're doing upon seeing that their master has returned. MASTER MIND I've got it! MASTER MIND It's plain and simple. Extraordinary minds need extraordinary stimulation. Without that stimulus they wither and die. Therefore, there is only one logical conclusion: I must create a new superhero. EINSTEIN Yeah, maybe that's not such hot idea... MASTER MIND (ignoring him) Prepare for Operation Superhero Genesis! INT. ABANDONED METRO CITY LIBRARY - LABORATORY - DAY The lab is slick, white and ultra modern. Dressed in a lab coat, Master Mind enters through a SLIDING GLASS DOOR rubbing his hands excitedly. MASTER MIND Prepare the subject. He glances down into a large HOLE in the floor to see a naked thirty year old man, SEVERS, shivering. Above the hole, a huge vat dangles precariously. Master Mind steps behind a glass partition next to Plato and Einstein. MASTER MIND (CONT'D) Plato, pour the toxic waste. Plato throws a switch causing the vat to tip hundreds of gallons of green and brown goo into the hole. MASTER MIND (CONT'D) Drainage. The slime is sucked out through the floor, leaving a goo- soaked Severs. 33. Master Mind looks into the pit. MASTER MIND (CONT'D) Well, Severs? SEVERS I feel fine. Just a little sticky, but aside from that everything's completely - BOOM - Severs explodes. A hail of blood and tissue covers Master Mind and his men. For a good ten seconds nobody moves an inch. Finally... MASTER MIND Okay then. INT. ABANDONED METRO CITY LIBRARY - LABORATORY - DAY Through a glass WATER TANK we see a man breathing normally. MASTER MIND And this one? PLATO We attached gills to him. He can breath under water. MASTER MIND Ah. Does he have extraordinary strength? PLATO Well...no. MASTER MIND Can he fly? PLATO No. MASTER MIND Resilient to weapons fire? PLATO No. MASTER MIND He just breathes under water, then. PLATO Ah...yeah. 34. Master Mind rolls his eyes and walks away. INT. ABANDONED METRO CITY LIBRARY - LABORATORY - DAY The next guinea-pig, STENWICK, is standing in a sealed glass tube not much wider than himself. MASTER MIND Plato, the radioactive spider, please. Plato throws the switch DROPPING A SINGLE SPIDER onto Stenwick's arm. Stenwick looks and winces as it bites him. STENWICK Ow! He brushes the spider off. MASTER MIND Anything, Stenwick? STENWICK (shaken) No. Ah...sir, I didn't know this was about spiders. I have a pretty severe case of arachnophobia. Master Mind thinks for a moment, then turns to Plato. MASTER MIND We're gonna need more venom. Plato throws another switch, this time DUMPING THOUSANDS OF SPIDERS on poor Stenwick. His SCREAMS begin to fade as he's engulfed with swarms of crawling arachnids. MASTER MIND (CONT'D) How `bout now, Stenwick? ....Stenwick? INT. ABANDONED METRO CITY LIBRARY - OFFICE - DAY Master Mind is pacing back and forth. The muted TV plays in the background. MASTER MIND This has proven to be a challenge. I just don't know what I want. What do I want? 35. He stares at Einstein, Da Vinci and Plato, but they offer no advice. MASTER MIND (CONT'D) I want a man of moral fiber with a strong sense of right and wrong. Someone who doesn't seek power - instead, they must have it thrust upon them and find, within themselves, the courage to rise to the occasion. Einstein lets out a short laugh, getting everyone's attention. EINSTEIN Yeah, well, it sounds like what you want is Uberman. Master Mind snaps the fingers of his non-metal hand. MASTER MIND That's it! Why make a copy when the real thing will do? The lackeys look at each other, they can't believe what they're hearing. EINSTEIN I was just kidding, sir. In case you forgot, you actually burned Uberman alive. MASTER MIND Then we'll make a new one. Plato, bring me the box! MINUTES LATER Master Mind and the lackeys stand in a circle around a small table. Plato places a STAINLESS STEEL CHEST in the tables center. As Master Mind opens it, he's immediately doused in WHITE GLOW emanating from inside. MASTER MIND Behold - Uberessence. The very thing that gave Uberman his superhuman powers. 36. EINSTEIN Where the hell did you get that? MASTER MIND Oh, I shot him with a power sucking gun and had this idea to use this to clone a whole army of evil Ubermen. I'm not sure why I never got around to following up with that. PLATO I believe he defeated you before you could, master. MASTER MIND ...Right. Man, he was good! DA VINCI You want another volunteer, sir? MASTER MIND Not another volunteer driven by the need for personal gain. Somebody else, somebody pure. Master Mind turns to see an INTERVIEW WITH HAL playing on the muted television. Underneath his face is a blue caption with white lettering that reads: "Hal Stewart - Metro City's Newest Hero?" NEWS REPORTER ...who risked his own life to save that of a young mother and her child. HAL Please, please, you're embarrassing me. I saw someone in need and I helped them. What more can we ask of ourselves. I ask you, what more? A smile creeps across the evil one's face. MASTER MIND (CONT'D) Somebody like him! EXT. CITY STREET - DAY Plato is sitting in the van, staring into a pair of binoculars as he speaks on a cellphone. 37. PLATO Yeah, sir. This guy is a real piece of work. He used to teach bowling at Kingpin's. INT. MASTER MIND'S HIDEOUT - DAY Master Mind is sitting with his feet up on a computer console as he speaks to Plato. MASTER MIND (into phone) A modest profession to brilliantly hide his true heroic nature. I love it. EXT. CITY STREET - DAY PLATO Then you are absolutely going to love this - We follow Plato's line of sight across the street where we see HAL PLAYING WITH A LARGE GROUP OF BLIND CHILDREN. PLATO - He volunteers at a school for the blind. INT. MASTER MIND'S HIDEOUT - DAY Intrigued, he suddenly sits up in his chair. MASTER MIND He volunteers. He doesn't ask for any reward for his deeds. The fates are shining down on me. This Mr. Stewart is truly an unselfish soul. EXT. BLIND SCHOOL - DAY From a distance, Hal seems to be consoling an upset child who's sitting on a rock. But up close... HAL You greedy little bastard. I already gave you a twenty. BLIND KID Hey, you want me to play along? Then pay up, bitch! 38. HAL Fine, but you better be convincing. He gives the kid a bill out of his wallet and looks over his shoulder to see a HOT TEACHER walking toward them. HAL Here she comes, go to work. Like a miniature Brando, the blind kid buries his face in his hands and begins to cry. BLIND KID (weeping) Why can't I see! Why God? Hal puts a warm consoling hand on the weeping boy's shoulder. HAL Hey, Peter. C'mon champ, let me look at you. The Hot Teacher stops and curiously watches from a distance. The boy looks up at Hal, tears running down his dark sunglasses - he should get an Oscar. HAL You know, in life we're all given no more than we can bear. This happened to you maybe because you were meant to rise above it - Maybe to be an inspiration to the other little Peteys out there. BLIND KID You really think so, Hal? HAL Hey, does it LOOK like I'm lying? Now c'mon, go feel your way to class before you get your little butt suspended. The boy stands up and is about to take off. HAL Petey, wait a minute. Hal uses his shirt sleeve to wipe the tears away from the boy's face before sending him on his way. 39. The Hot Teacher grabs her chest. Her heart is about to absolutely melt. HAL Don't run into anything! EXT. STREET - CONTINUOUS Plato lowers his binoculars. From his perspective, Hal should be next in line for popehood. PLATO I think I've seen enough, sir. This is your guy. MASTER MIND (O.S.) (over radio) Then return to base. We have much work to do. Plato starts up the van and pulls away. INT. BAR - DAY It's a busy night. A couple of trucker types are shooting pool as the bartender slings drinks. Hal is nursing a beer at the bar when he suddenly notices a very ATTRACTIVE WOMAN sitting next to him. As he goes to straighten his stool-posture, Hal suddenly catches himself on the bar's TELEVISION - it's a story about how he saved the woman and her baby at the construction site. He turns back to the Attractive Woman next to him, then back to the TV. A plan of attack is forming. HAL (obviously playing it up for the woman's benefit) Oh, there it is again. This is really getting embarrassing now. The woman looks up at the screen and gives Hal a double-take. ATTRACTIVE WOMAN Oh my God! It's you! You're the man who saved that woman and her baby the other day! It is you, isn't it? TRUCKER #1, getting a drink at the bar next to them, OVERHEARS. 40. Hal rolls his eyes and puts his hands up in the air. HAL (to Attractive Woman) Oh, crap. You got me. TRUCKER#1 taps Hal on the shoulder. TRUCKER#1 Let me tell you something. That was just about the bravest damn thing I've ever witnessed. (he turns to the rest of the bar) Hey, everybody! This guy's the hero from TV! The bar ERUPTS IN CHEERS. MOMENTS LATER Hal is riding on the shoulders of TRUCKER#2 and TRUCKER#3 as `I'm Holding Out For A Hero' plays on the jukebox. TRUCKER#1 suddenly puts his hands in the air. The room quickly goes silent. TRUCKER#1 I want to give you something. He reaches into his pocket and takes out a medal. He holds it up in the air for everyone to see. TRUCKER#1 (CONT'D) Lost my whole platoon. They were a lot a good boys, a lot of good boys. That was just the way things were in "The Grenada." I'd rather a real hero have this. Trucker#1 gives the medal to a speechless Hal. ATTRACTIVE WOMAN Hey, you're on TV again. The crowd looks up at the Television. TELEVISION - CONTINUOUS The anchor man, BRAD HELMS (early 40's, amazing mustache), suddenly has a memo passed to him. 41. BRAD HELMS This just in. Upon a second look at that tape from this morning, which we'll now replay for you, it appears it was not the heroic act it first seemed to be. The tape shows Hal running in slow motion. BRAD HELMS (O.S.) (CONT'D) With the tape slowed down you can actually see the man push the woman and her child out of the way in an effort to save his own life. The tape shows Hal, in a clear act of self-preservation, pushing the woman and child out of the way. CUT BACK TO: INT. BAR - CONTINUOUS In unison, everyone turns their heads back to Hal. HAL I guess that looks kinda bad. Trucker#1 snatches his medal back. EXT. NEARBY ROOF - NIGHT Master Mind, Da Vinci and Plato look down, spotting Hal cutting through a dark alley. DA VINCI There he is, boss. Da Vinci hands Master Mind a fantastic looking silver rifle. MASTER MIND Now, we're sure this won't kill him? PLATO Yes, sir. He'll just feel a slight electrical shock. MASTER MIND Good. Master Mind raises the rifle and aims it at Hal. 42. EXT. ALLEY - NIGHT Hal wipes the blood from his nose with his shirtsleeve. A LIGHTENING BOLT suddenly zaps Hal in the back. His teeth spark and arc electrons as his entire body shakes and shudders violently. He finally collapses, knocking over a row of garbage cans. EXT. NEARBY ROOF - NIGHT An angry Master Mind slaps Plato. MASTER MIND Slight electrical shock? EXT. ALLEY - NIGHT Hal lies flat on his back, his jacket smoldering. Dazed, he slowly rises to his feet and looks up at the sky. HAL God, I hate the weather in this city. Hal walks off into the night as he attempts to slap the emitting smoke from his jacket. EXT. NEARBY ROOF - NIGHT Master Mind turns to Da Vinci. MASTER MIND Follow him. INT. HAL'S APARTMENT - NIGHT It's a dirty, small studio. Laundry lies everywhere, dishes are piled in the sink and the litter box looks like a minefield. Hal comes staggering in. Through his POV we see the lights wobble and streak like a hallucination. He shakes his head trying to clear thing up, but it looks worse. Hal makes his way to the kitchen table and plops down on a chair. The room begins to swim. His CAT jumps on the table and sits down in front of him. 43. From Hal's POV the cat's face looks like we're seeing it through a kaleidoscope. Hal seems fascinated by it. CAT You don't look so good, man. HAL I don't feel good. I was struck by freaking lightening. Suddenly Hal realizes his cat's talking to him. HAL (CONT'D) AAAAAAHHHHH! You can talk? CAT No, you're just hallucinating. By the way, we're out of orange juice. HAL AAAAAAHHHHH! Hal jumps up, trips over a cardboard box and knocks himself out on the coffee table. INT. HAL'S APARTMENT - MORNING Hal lies in the same position we left him last night. He sits up and grabs his head. He looks like he has the worst hangover in the world. Finally, he remembers last night. He looks around, but not really sure what he's looking for. HAL Man... Shaking his head, he walks to the kitchen and opens the refrigerator. He pulls out an orange juice container and puts it to his mouth. It's empty. As if suddenly remembering something he looks from the carton to the cat, who is busy cleaning himself. He shakes the thought from his mind. BATHROOM Hal lifts the seat and unbuckles his pants. 44. HAL'S FACE He stares at the ceiling with half closed eyes. The inevitable sound of urine hitting water starts. A content look washes over his face. There is a distinct sound of porcelain CRACKING and SPLINTERING. The sound intensifies. Hal looks down to see his URINE STREAM SMASHING THE TOILET. HAL (CONT'D) Oh, God! He whips his stream away only to cut a LONG RIP IN THE WALL. HAL (CONT'D) Oh, God! He freaks out and begins to lose control of his flow as it destroys everything he accidently aims at; the bathroom mirror, a bottle of cheap cologne, the bathroom window. HAL (CONT'D) Oh, God! He aims back for the toilet, which is pretty much rubble now, to see the floor give way. Finally, the pee stops and he glances down the hole. He sees his downstairs NEIGHBOR sitting at his breakfast table. He has a fork halfway to his mouth as he stares at the smashed toilet on his pancakes. EXT. STREET - DAY Hal turns the corner to see his bus pulling away from the stop. HAL Wait! He starts running after it. ZOOM - HE TAKES OFF LIKE LIGHTENING. HAL (CONT'D) Whoa, whoa, whoa! Unable to stop, he SLAMS INTO THE BACK OF THE BUS and falls back to the ground. 45. As the bus continues on he sees an INDENTATION of his torso right below the rear window. Stunned, to say the least, he rises to his feet. HAL (CONT'D) Something's not right here. He slaps himself in the face as hard as he can. HAL (CONT'D) Wake up! Wake up, Hal! HONK! Hal spins around to see a car barreling toward him. He goes to jump out of the way - ZOOM - he FLIES TWO STORIES UP, nails a building and comes crashing back down to the sidewalk. Hal sits up, disheveled and scared. HAL (CONT'D) Okay, okay. Let's get it together, man. He closes his eyes in an attempt to will back his sanity. HAL (CONT'D) This is just some sort of...episode. It will pass, it will pass. He opens his eyes and looks down the street. A BEAUTIFUL NAKED WOMAN is coming toward him. HAL (CONT'D) Well, not too fast I hope. As she passes him and turns the corner out of his view he catches ANOTHER NAKED WOMAN - an old disgusting one. HAL (CONT'D) Yes, fast, fast! He turns away from her in horror only to see AN ENTIRE BLOCK OF NAKED PEOPLE going about their business. He rubs his eyes and looks down the street again. Everyone has returned to a clothed state. 46. He relaxes a little until he looks down and notices that he's floating a foot off the ground. HAL (CONT'D) I think I need to go home. INT. HAL'S APARTMENT - DAY Hal's front door CREAKS as it slowly opens, revealing Master Mind. He walks over to the bathroom and smiles to himself as he notices the giant hole in the floor. MASTER MIND Welcome to your second birth, Hal Stewart. Master Mind continues to survey the room. He stops to look over a "KARATE KID" POSTER on Hal's living room wall. He focuses on the majestic image of Pat Morita teaching a young Ralph Macchio to kick. MASTER MIND (CONT'D) Instruction is very important in the formative years. Every hero needs a mentor, a father figure to look up to. He presses his special watch, causing his body to MORPH INTO THE SPITTING-IMAGE OF PAT MORITA. "PAT MORITA" Perfect. INT. HAL'S APARTMENT - DAY Hal enters, grabs a bottle of vodka from atop of the fridge and takes a long pull from it. VOICE (O.S.) A man will usually find that if he drinks from a bottle, eventually, the bottle drinks from him. Hal does a SPIT TAKE. In the corner a darkened figure stands. HAL Who are you!? 47. VOICE I am the guide on your journey. Fate has chosen you to be it's champion. Pat Morita steps out from the shadows. Hal passes out again. LATER We are close on Hal's face as his eyes flutter open. He appears to be lying on the couch. He hunches up on his elbows, looks around, but everything is as it seems. He lays his head back down. HAL Thank God. It was a dream. Man, I must be losing it. A voice sounds right next to his ear. "PAT MORITA" (O.S.) You know you're out of orange juice? Hal leaps up to find he's been resting his head on Pat's lap. HAL Jesus! This isn't happening, this isn't happening. Hal backs away and trips over a box. "PAT MORITA" Calm. All things must be filtered through calmness. HAL Bullshit! Sometimes it's best to freak out. "PAT MORITA" I think we must work on your attitude first. HAL Look I'm gonna call the cops in about two seconds if you don't get out of here. 48. Pat rises and walks to Hal. He's so calm it makes Hal calm. "PAT MORITA" Are you calm now? HAL Yeah, I'm okay. Pat slaps him across the face hard. "PAT MORITA" Good, because we've got a lot of work to do. Hal grabs his jaw. HAL What the hell was that for? "PAT MORITA" Rule number one: expect the unexpected. HAL Can you just tell me what this is all about? "PAT MORITA" The heavens are not in the habit of bestowing a gift such as this to just anyone. You are being rewarded for being a man of great moral fortitude with an unwavering belief in humanity. HAL That's me alright. "PAT MORITA" I am to train you so you may fulfill your destiny to defeat the great menace to Metro City: Master Mind. Pat gets up and walks toward the door. "PAT MORITA" (CONT'D) Come. HAL We're are we going? 49. "PAT MORITA" To train. EXT. PAT'S CAR - DAY Pat is sitting in the driver's seat. The car is bumping up and down. "PAT MORITA" Strength is just as much in the mind as it is the muscle. Remember, both need to be exercised. We PULL BACK to see Hal lifting the car up over his head. He's hardly straining. HAL I'M LIFTING A FREAKING CAR!!! Pat leans on the HORN. "PAT MORITA" Hey, Corky? You listening? Two highly attractive female joggers run by. They're clearly impressed with Hal's show of strength. He smiles and mouths a "hello." HAL Yeah, work both muscles. EXT. DESERT - DAY Pat cocks back the chamber of a .357 MAGNUM. He holds it up and carefully takes aim...at Hal's chest. "PAT MORITA" Trust me. HAL What are you doing!? "PAT MORITA" An invulnerability test. Something wrong? HAL Uh...yeah. I would prefer not to get shot. Do not fire that thing! Frustrated, Pat lowers the gun. 50. "PAT MORITA" You're bulletproof. HAL Okay, do you know that for sure? Pat quickly aims and fires. Hal lets out a high pitched scream as the bullet ricochets off his chest. "PAT MORITA" I do now. Hal looks down at his chest, not so much as a scratch. HAL You suck. EXT. SKY - DAY Hal is in the air flying in a sitting position. He's weaving back and forth. HAL Ice Man, I got a bogie on my tail. Two Russian Migs coming in hard and fast. "PAT MORITA" Hey! HAL What? Hal looks down to see Pat Morita yelling at him from the roof of a building down below. "PAT MORITA" What did I tell you? Stomach down, hands up. Hal sighs and assumes the proper superhero in-flight position. HAL God, I feel so gay. Pat's CELL PHONE begins to RING. He answers it. "PAT MORITA" (in Master Mind voice) What is it? 51. ROXANNE (V.O.) John? Pat panics. He looks up to make sure no one is in earshot. He sees Hal now doing somersaults in the air. HAL YEEEE HAWWWW! Pat turns his attention back to the phone, talking in his John Cusack voice. "PAT MORITA" (in Cusack voice) Yes, it's John Cusack. ROXANNE (V.O.) Hi, it's Roxanne. Listen, I...I really enjoyed talking with you the other day. "PAT MORITA" ...As did I. ROXANNE (V.O.) Great. God, I feel really silly, and if you have a lot going on I totally understand. But, I was wondering if you maybe wanted to have lunch. He can't believe what he's hearing. "PAT MORITA" (excited) I'd love to! He quickly recovers his composure. "PAT MORITA" (CONT'D) I mean, I AM a little hungry. ROXANNE (V.O.) Great. How does the park sound, around noon-ish? "PAT MORITA" Sure! ROXANNE (V.O.) Great, see you then. 52. Pat hangs up the phone and returns it to his pocket as Hal lands behind him. HAL WHOOOOA! Man, that is so cool. It's like fly - Oh my God, I almost said it was like flying. "PAT MORITA" For the rest of the day I want you to continue to practice your flying posture. HAL Why, where're ya going? "PAT MORITA" ...To do something...mysterious ...and Asian. HAL Say no more, bro. I'll just keep at it, then. EXT. PARK - DAY John Cusack and Roxanne eat WRAPPED SANDWICHES while walking through Metro City Park. ROXANNE How's your sandwich? "JOHN CUSACK" It's quite delicious. ROXANNE Hope you don't think I'm too forward. Some men are intimidated when a woman asks them out. I just find you really easy to talk to. "JOHN CUSACK" And I you. ROXANNE You know, you're not at all like you are in the movies. "JOHN CUSACK" I'm not? 53. ROXANNE Yeah. I don't know - You have this strange, refined way of speaking. "JOHN CUSACK" I do? That is most interesting. ROXANNE Anyway, when we were talking the other day I just felt, even though we only talked for a couple of hours, that we've known each other for years. "JOHN CUSACK" I know just what you mean. Roxanne bites into her sandwich. ROXANNE You know what? This sandwich is disgusting. She tosses it in a nearby garbage can. ROXANNE (CONT'D) Of course I already ate half of it. I wonder what that says about my character? "JOHN CUSACK" It means you don't give up on a sandwich. You see that it has potential, and you give it every chance to be all it can be. Roxanne smiles at his analogy. ROXANNE Thanks, but knowing me, I was probably projecting my expectations of what a lunch should be on the sandwich. It might have been okay at first, but I just made it bitter. John Cusack notices Roxanne's smile starting to fade. "JOHN CUSACK" Is that what happened with your last sandwich - I mean, boyfriend? 54. ROXANNE When I look back, I probably shouldn't of expected so much from him. He was already a giving person. You know, one of those go out and save the world types. "JOHN CUSACK" I've run into a few. ROXANNE I was selfish, I guess. I didn't want to share him with anybody else. "JOHN CUSACK" It sounds like he was a special man. ROXANNE They broke the mold. John Cusack arches his eyebrow in a very familiar manner. "JOHN CUSACK" Perhaps not. INT. ABANDONED WAREHOUSE - DAY Hal walks up to Pat Morita sporting a Lone Ranger-type mask and wearing a purple and red superhero costume. It's not unlike Uberman's except for a giant "T" on his chest. (From here on, Hal is referred to as TITAN) TITAN What's the "T" stand for? "PAT MORITA" Titan. TITAN What's that supposed to mean? "PAT MORITA" It's from Roman mythology. Zeus's father...oh, just go with it. You look perfect. TITAN I don't think this mask is big enough. Are you sure no one is gonna recognize me? 55. "PAT MORITA" It's fine, just don't slouch. It's all in the posture. He grabs Titan's shoulders like a proud papa. "PAT MORITA" (CONT'D) It is time. INT. BANK - DAY There is a long line of people snaked around the velvet ropes. They're all waiting for their chance at the one open teller window. Four men wearing BEATLES MASKS(JOHN,PAUL,GEORGE,AND RINGO)and CARRYING SHOTGUNS enter the bank. John fires a shot in the air, sending everyone into an immediate panic. JOHN Alright folks, this is a robbery. Nobody moves - yadda, yadda, yadda... Ringo jumps over the teller wall and starts stuffing bills into a bag. As John and Paul cover the crowd, George goes to the corner office and puts a gun to the BANK MANAGER'S head. GEORGE The safe. Let's go. BANK MANAGER Okay, just don't hurt anyone. GEORGE Yeah, yeah, yeah. George leads him out by the collar. CRASH - Titan smashes through the window and lands in a bold superhero stance with hands on hips. TITAN Well, boys, there's no need for all this just to get the free toaster. Paul cocks his gun. 56. PAUL What are you suppose to be? We move in for a nice dramatic close up. TITAN Justice. GEORGE Well, justice, suck on this... George, John and Paul open fire on Titan. He just stands there and yawns as the bullets bounce off him. With their guns empty the three just stare at him in amazement. TITAN Now it's my turn. He turns to George. TITAN (CONT'D) Hey, George, here comes the sun. Titan grabs George and throws him into a fluorescent light fixture in the ceiling. Paul tries to run for the door. Titan snatches the collar of his jacket. TITAN (CONT'D) Say, Paul, your mother should know...that you're a scumbag. He tosses Paul out the window and into a parked DELIVERY TRUCK. Titan turns around just as John hits him with the butt of his shotgun. It instantly breaks apart in his hands. Titan lifts him like a rag doll up into the air. TITAN (CONT'D) John, all you need is love... He throws John who lands on top of a cubical wall - GROIN FIRST. TITAN (CONT'D) ...and a good urologist. 57. Titan effortlessly hops over the teller wall to find Ringo cowering on the floor. He grabs him by the shirt and lifts him up. HAL Well, Ringo...um...um...you're under arrest. EXT. BANK - DAY Titan walks out of the bank with Ringo and George under his arm. He's suddenly swarmed by a group of television reporters, including Roxanne. Across the street is Pat Morita. He watches Titan's first news conference with great anxiety. BANK MANAGER (to Hal) On behalf of the First National Bank of Metro City, I'd like to offer you a reward for your act of bravery. He hands Titan a check. TITAN (reading) Ten thousand dollars! Titan looks over to Pat, who violently shakes his head no. TITAN (CONT'D) (unenthusiastically) I...can't except this. Law and order is it's own...um...reward. Pat gives him the thumbs up. Pat turns, suddenly seeing Roxanne with her camera crew. Captivated, his eyes lock on her. Meanwhile, Roxanne and her cameraman, SETH, are maneuvering around the crowd to get closer to Titan. BRAD HELMS (O.S.) Not so fast, Roxanne. They both turn to see Roxanne's reporter rival Brad Helms, Geraldo without the class, and his cameraman, FRANK. BRAD HELMS This story's mine. 58. ROXANNE Listen, Brad. We were just in the area. I was just trying to - BRAD HELMS I've been in this business long enough to know pretty well what you were "just trying to do." Besides, I heard you couldn't take the big game anymore and were put on fluff detail? Dejected, Roxanne turns and motions for Seth to turn the camera off. SETH You're not gonna take that from him, are you? ROXANNE He's right. Old habit, I guess. (to Brad) We'll get out of your way. As they walk off, Brad makes a comment to Frank loud enough for her to hear. BRAD HELMS Besides, I'm sure there's a pancake supper somewhere that needs covering. INT. ABANDONED METRO CITY LIBRARY - OFFICE - DAY ON TELEVISION We see the news conference on the bank's steps. In the corner of the screen is written: "recorded earlier." BRAD HELMS For months now, since the death of Uberman, the citizens of Metro City have been holding out for a hero. Well, it appears they won't have to hold out for much longer as a new costumed crusader has suddenly stormed onto the scene. Today, at the Metro Savings and Trust, a masked mystery man single-handedly defeated "The Fab Four Gang." Just who is this new caped avenger? Brad holds the microphone to Titan's face. 59. BRAD HELMS I'm sure all of our viewers are now wondering, what's the "T" stand for? TITAN It's a message to all the scum out there. Uberman may be gone, but Metro City has a new protector, and his name is "Tighten!" Another reporter leans in. REPORTER How do you spell that? We PULL BACK to see Plato and Da Vinci watching this spectacle. Master Mind is sitting with them, reading a NEWSPAPER. MASTER MIND (reading paper) Oh, for heaven's sake. I can't believe it. He misspelled his name. Master Mind holds up the newspaper. The headline reads "Metro's New Hero: Tighten." MASTER MIND (CONT'D) No matter, I suppose. Master Mind throws the paper on the floor and begins to pace around the room with his arms folded behind his back. MASTER MIND (CONT'D) We've now fully established Titan as Metro City's hero. They will love him just as they loved Uberman. Everything is going according to plan. Einstein leans over and whispers in Plato's ear. EINSTEIN (whispering) Yeah, if the plan is getting us in jail. Master Mind turns around, facing Einstein. He walks over, standing face to face with the rebellious henchmen. 60. MASTER MIND You know, Einstein, maybe I should have called you Socrates. He also didn't know when to keep his thoughts to himself. EINSTEIN I just fail to see the point in all of this. I mean, why are we creating another superhero when it was such a pain in the ass for you to get rid of the other one? I mean, Uberman is destroyed, we should be using this opportunity to...to... MASTER MIND To what? EINSTEIN I don't know. To take over the weather, space, the world - whatever super villains are SUPPOSED to do. MASTER MIND The reason someone like you will always be a minion is because you have no foresight. We take over the earth, like you said. Then what? Women? Cars? Money? Even the grandest treasures will lose their lustre if you don't have someone to hold them over. Einstein throws up his hands. He's had enough. He pulls off his wig and throws it to the floor. EINSTEIN That's it! This balance of the force bullshit is getting way too Oprah for me. I'm blowing. Who's with me? MASTER MIND You dare? EINSTEIN Yeah, I dare. I'm sick of wearing stupid costumes, and I'm sick of working for a super villain who's turning into a softie. 61. Plato and Da Vinci's mouths drop to the floor. They turn to Master Mind for his rebuttal. MASTER MIND What - did - you - call me? EINSTEIN You heard me. You used to be an inhuman monster, now look at you. You're creating super heroes, you don't go with us on robberies anymore, it's been days since you threatened anyone, oh, and not to mention this Roxanne Ritchi thing. MASTER MIND THAT is none of your business, knave! EINSTEIN Hey, you guys haven't sealed the deal yet, have you? MASTER MIND Silence! EINSTEIN (In a woman's voice) Oh, Master, your head is so big. MASTER MIND I'm warning you, Einstein. EINSTEIN (In a woman's voice) Take me! MASTER MIND I said silence! With his metal gauntlet Master Mind grabs Einstein by the throat and lifts him into the air. Einstein looks frightened as he tries to pry himself free of Master Mind's grip. Master Mind's eyes soften as if his heart is suddenly not into what he's about to do. He let's Einstein drop to the floor. MASTER MIND (CONT'D) Get out of my sight. 62. EXT. RESTAURANT - NIGHT Roxanne and John Cusack are eating on the outside patio of a fancy restaurant. ROXANNE Don't get me wrong, I love being a reporter. I don't think I could do anything else. It's the consequences of what we do that I'm having a problem with. He listens intently as he refills her glass with wine. "JOHN CUSACK" That's where journalistic responsibility comes in, no? ROXANNE It's supposed to. "JOHN CUSACK" Sounds to me like you're running from something. ROXANNE I got someone I cared about killed. If it wasn't for me, he wouldn't have been involved. John suddenly gets a disturbed look in his eye, realizing what she's talking about. He reaches across the table and takes her hand. "JOHN CUSACK" You can't blame yourself. My father used to say each of us must answer the great call to truly feel alive. ROXANNE Was he an actor? "JOHN CUSACK" ...No. He was...a landscaper. And a horrible one. I mean he would fail time and time again at his...landscaping. And sometimes he'd get pretty beaten up or thrown in jail - ROXANNE Jail? 63. "JOHN CUSACK" My point is he took the good with the bad. He grew a little each time. Improved, learned. ROXANNE Was he ever successful? "JOHN CUSACK" God, no...but don't let deter you. Roxanne LAUGHS. ROXANNE Thanks for this. You know, this is embarrassing, but it's been a long time since I - It's starting to lightly sprinkle. Roxanne looks up. ROXANNE (CONT'D) I think it's starting to rain. We might want to find a table inside. "JOHN CUSACK" What were you gonna say? ROXANNE Oh, I was gonna say...It's been a long time since...well, I've been with someone I...enjoy being with. John Cusack smiles warmly and raises his glass for a toast. "JOHN CUSACK" To people who enjoy being with each other. They go to clang glasses, when the rain suddenly causes John Cusack's disguise generator to short. His true form of Master Mind is briefly revealed to Roxanne as a BOLT OF ELECTRICITY encircles his body. Roxanne drops her glass and jumps out of her seat. MASTER MIND (CONT'D) Oh, no. Don't look at me. LIKE A BROKEN TV the image keeps switching between MASTER MIND AND JOHN CUSACK. 64. As Master Mind starts to franticly slap at his watch, the Cusack disguise begins to hold steady. He nonchalantly returns to cutting his steak. "JOHN CUSACK" Okay, never mind that. Now, where were we? Roxanne grabs his glass and throws the drink in his face, causing the generator to short out permanently. Master Mind now sits in his true blue form. ROXANNE Oh my God. MASTER MIND You're not gonna get all freaky about this, are you? ROXANNE This...this is too much, even for you. God, I go out with you, tell you my innermost thoughts. MASTER MIND I only did this because I wanted to talk to you on the same level. You know, without all the baggage? ROXANNE Baggage? You burned my boyfriend alive, you sick son-of-a-bitch! MASTER MIND You see, that's exactly what I'm talking about. Roxanne starts to walk away. MASTER MIND (CONT'D) Roxanne! ROXANNE Stay away from me. Master Mind sinks back down to his chair. Despite the now heavy rain bombarding him, he returns to his food. Several resturaunt patron's are looking at him through the window. 65. Our villain turns to them, giving them a villainous glare. MASTER MIND What? INT. MASTER MIND'S BEDROOM - NIGHT Master Mind is lying on his back, wide awake. MASTER MIND (mumbling to himself) Stupid. What was I thinking? Plato, it's his fault. He's the one who sent me on this weak-willed path. I'll filet his scrotum for this. Me, a creature of evil, in love with Roxanne Ritchi. Preposterous. I hardly give such matters thought He rolls onto his side. He yawns and closes his eyes. Suddenly, they shoot back open. CUT TO: EXT. ROXANNE'S APARTMENT - NIGHT Master Mind pulls up in a blue Rolls Royce, across the street from Roxanne's apartment He stares up at the building, hoping to catch a glimpse of her. Finally, she appears, primping her hair in her apartment window's reflection. MASTER MIND I should just go up there and just lay it all out to her. "Roxanne, I like you - I always have. Oh, and I'm sorry I blew up your ex. (realizing the absurdity of his words) Yeah, that would go over like a pants-less clown at a child's birthday party. What the hell am I even doing here? Who cares what she thinks? I'm a supervillain and here I am acting like a love struck schoolboy. Forget this. I control my own destiny! 66. He turns the ignition key - NOTHING HAPPENS. He repeats but gets the same results. MASTER MIND (CONT'D) (disgusted) Perfect. INT. ROXANNE'S APARTMENT - NIGHT She pulls a pack of smokes off her night stand. Empty. ROXANNE Damn. She grabs her long coat and throws it over her robe. EXT. ROXANNE'S APARTMENT BUILDING Roxanne steps outside. ROXANNE Please be open. Across the street is a liquor store. The light is still on. ROXANNE (CONT'D) Thank God. She walks across the street, passing in front of Master Mind's car. Spotting her, he sinks down in his seat. Roxanne walks by, totally unaware of his presence. Relieved, Master Mind sits back up and watches her go into the store. INT. LIQUOR STORE - NIGHT Roxanne walks up to an elderly Korean SHOPKEEPER at the counter. ROXANNE A pack of Lady Strikes, please. EXT. MASTER MIND'S CAR - NIGHT Master Mind is talking on his cell phone. MASTER MIND Hello, Triple A? 67. He suddenly spots something across the street. EXT. LIQUOR STORE - NIGHT A HOODLUM walks up to the entrance of the store and pulls out a gun from under his coat. EXT. MASTER MIND'S CAR - NIGHT Master Mind stares in shock. MASTER MIND I'll call you back. He hangs up the phone and watches the Hoodlum go inside the store. INT. LIQUOR STORE - NIGHT The Hoodlum reaches across the counter and grabs a fist full of cash from the register. SHOPKEEPER Hey! SHOTGUN HOODLUM Shut up, Gramps. He turns to Roxanne, spotting a GOLD NECKLACE around her neck. SHOTGUN HOODLUM (CONT'D) Gimme that necklace! ROXANNE I don't think so. The Hoodlum cocks his shotgun. SHOTGUN HOODLUM I said give it to me! MASTER MIND (O.S.) The lady said no. The hoodlum turns around to see Master Mind in the doorway holding a STRANGE-LOOKING HAND CANNON (GOO GUN) with knobs and blinking lights. The hoodlum starts to laugh. 68. SHOTGUN HOODLUM What the hell's that? A super soaker? MASTER MIND No, it's a goo gun. The hoodlum turns his gun to Master Mind. SHOTGUN HOODLUM Yeah, what's it do? MASTER MIND It goos. Master Mind fires the cannon. It instantly covers the store in a cloud of SMOKE. The smoke clears to reveal the hoodlum STUCK TO THE WALL, covered in a thick, GREEN GUNK. Roxanne stares at him, dumbfounded. MASTER MIND (CONT'D) It's...a prototype. Master Mind starts to walk out when he's suddenly confronted by the shopkeeper. SHOPKEEPER I know you! You Master Brain guy. You a hero. Master Mind points the goo gun at him. MASTER MIND Don't - EVER - say that again. EXT. LIQUOR STORE - NIGHT Master Mind walks out with the cannon resting on his shoulder like he's a short timer in Da Nang. Roxanne follows shortly behind him. ROXANNE Hey! Master Mind turns around. ROXANNE (CONT'D) Are you following me or something? 69. MASTER MIND Don't flatter yourself. He turns away and continues walking. Roxanne runs in front of him blocking his way. ROXANNE Don't walk away from me when I'm talking to you. Finally it occurs to her what's going on. ROXANNE (CONT'D) What a minute...all that stuff you use to say to me when Uberman was alive - about me being the loyal queen by your side as you rule over Metro City. That wasn't just super villain rhetoric, was it? You actually meant it! MASTER MIND My, someone has a rather high opinion of themselves. They stare at each other in silence, their glares locked in conflict. ROXANNE (coldly) Do you really think I would be with someone like you? This stings Master Mind to the bone. And after a brief contemplation, he reaches the only logical, painful conclusion. MASTER MIND No. With that, Master Mind exits into the night, leaving Roxanne with a baffled expression on her face. INT. ABANDONED METRO CITY LIBRARY - NIGHT Master Mind enters in a huff. Da Vinci closes the door behind him as Plato notices his master's agitated state. PLATO Everything alright, sir? Master Mind GRABS PLATO BY THE GROIN with his metal gauntlet causing Plato's eyes to bulge in pain. 70. MASTER MIND (overly calm) Fine, why do you ask? PLATO You...just...seem... Master Mind tightens his grip. MASTER MIND Go on. PLATO ...distracted. Master Mind releases him. MASTER MIND Just with business, my minion. Just with business. I've decided it is time. PLATO You mean? MASTER MIND Yes, we've created our hero, now it's time to give him a little motivation. DA VINCI How do we do that? MASTER MIND To be simply good is not enough. A hero must be driven by an almost relentless desire to right a wrong that can never be corrected. PLATO You mean? MASTER MIND Yes, he must lose someone near and dear to him - his father figure. Gentlemen, it's time for Operation Mentor Kill! EXT. SKY OVER METRO CITY - DAY Titan flies high over and through the city, under bridges, between buildings, etc. He's not really working, just enjoying himself. 71. INT. WOMAN'S APARTMENT - NIGHT A PRETTY WOMAN sits at her makeup table wearing nothing but her bra and panties. Through the reflection in her mirror we see a large window directly behind her. As she applies lipstick we see Titan fly quickly by in the background. After a moment he slowly slides back in view and begins ogling the girl. She sees him in the mirror and quickly covers herself with a robe. Titan tries to hide his face as he zooms off. MOMENTS LATER Titan looks down to see an APARTMENT BUILDING IN RUIN. Emergency lights flash around it as swarms of people run around in chaos. TITAN Man, what the hell happened down there? Wait a sec - He stops in mid-air as he comes to the striking realization. TITAN (CONT'D) THAT'S MY APARTMENT!!! EXT. HAL'S APARTMENT BUILDING - DAY Titan lands in front of the rubble that was once his home. Reporters stand just beyond the police line. TITAN Crap. From the wreckage crawls a dying Pat Morita. TITAN (CONT'D) PAT! Titan goes and kneels beside Pat, holding him in his arms. TITAN (CONT'D) You okay? "PAT MORITA" I'm dying, kid. There is just one last lesson I have for you. It is the most important of all. 72. TITAN What's that? "PAT MORITA" Master Mind did this, you must avenge me. TITAN Master Mind? Why? "PAT MORITA" Because he's evil. You must stop the evil Hal - stop the... Pat's body goes limp. The cameras begin to pop and flash around them. Titan gently lays Pat's body down and stands respectfully over him. The reporters rush over. REPORTER 1 Tighten, Is this the work of Master Mind? REPORTER 2 How will the death of your mentor affect your resolve? REPORTER 3 Was that Pat Morita? Titan walks up to one of the cameras. TITAN This injustice will not go unpunished. Master Mind, if you can hear me, Tighten is coming for you. In the background we see Plato and Da Vinci, DRESSED AS PARAMEDICS, load pat's body onto a stretcher. PLATO ACCIDENTALLY DROPS HIS SIDE. As he bends down to pick it back up, Pat quickly slaps him, then goes back to playing dead. INT. ABANDONED METRO CITY LIBRARY - NIGHT Master Mind and the boys prepare the fortress for Hal's revenge attack. Master Mind is as giddy as a schoolboy. 73. MASTER MIND Alright, people, we don't have much time. Titan should be here any minute, so let's get the lead out. There is a GIANT MOUNTED DEATH RAY in the middle of the hall being tinkered with by Da Vinci. MASTER MIND (CONT'D) How's the death ray coming? DA VINCI Nearly up to full power, sir. MASTER MIND Hum. Let's turn it down a few notches. It's his first time and we don't want to get in a lucky shot, now do we? Plato enters the room. MASTER MIND (CONT'D) Anything on the radar yet? PLATO Not yet, sir. MASTER MIND I see. Well, he must be planning something big. Are the flame androids deployed? PLATO All twelve. Master Mind rubs his hands in anticipation as he sits down on his throne. MASTER MIND Wonderful, wonderful. Plato, Da Vinci, take your places next to me. They move to either side of the chair. MASTER MIND (CONT'D) No slouching. Da Vinci straightens up and sucks in his gut. They remain this way for several long moments. Master Mind occasionally glances at a DIGITAL CLOCK on the wall. Still no Titan. 74. LATER Apparently quite some time has passed. The bold stances have degraded to fatigue. PLATO He's certainly taking his time. MASTER MIND He'll be here. That's the way it works. STILL LATER Master Mind reclines in his chair and taps his metal gauntlet impatiently on the armrest. Plato has squatted down, resting his chin on his hand. MASTER MIND (CONT'D) Unprofessional, that's what this is. No, it's disrespect for the craft. Master Mind rises and begins to pace back and forth. MASTER MIND (CONT'D) Would Uberman have kept us waiting like this? Of course not. He was a pro who knew the score. It's time we spelled out a few things for this Titan. I will not be made a fool of. He storms out of the room. INT. HAL'S NEW APARTMENT - DAY Titan's sitting on the floor in a barren apartment wearing his costume top and some tighty whities. He sips his beer as he watches a basketball game on a tiny TV. Much to his annoyance, there's a KNOCK at the door. TITAN Oh, for crying out loud. He gets up and opens the door. It's Master Mind. MASTER MIND Do you know who I am? 75. It takes a few moments to register, but Titan's suddenly excited. TITAN Yeah, you're Master Mind. Yeah! You're actually the guy I want to see! MASTER MIND Oh, so NOW you want to get down to it. Well, I want to get a few things off my chest first. Master Mind walks past Titan into the apartment. He spins around, pointing at him accusingly with one of his metal fingers. MASTER MIND (CONT'D) Of all the inconsiderate - Do you have any idea how long we waited for you? We're you even planning on coming to me and getting revenge? Titan shuts the apartment door, and turns back toward his guest. TITAN Well, at first I was going to. You know, because that's what I figured I was supposed to do. But then I got to thinking- MASTER MIND (interrupting) -You got to thinking? There's nothing to think about. I'm the villain. I do something bad, you come and get me. TITAN - I got to thinking...what's the point? Master Mind throws up his hands. MASTER MIND Maybe you're right. What's the point? He suddenly notices something in the corner of his eye. He walks over to a futon in the living room. On top of it is a LARGE SACK OVERFLOWING WITH GOLD WATCHES,RINGS AND OTHER VALUABLES. 76. MASTER MIND (CONT'D) What are these? TITAN That's what I wanted to talk to you about. MASTER MIND (baffled) Where did you get all this? TITAN (proudly) Get this: I stole them. MASTER MIND From where? TITAN From all over. You see, once you killed Pat and ruined my other apartment building I was pretty pissed off, so I figured I'd go, find you and kick some ass. Then I thought to myself: "Okay,then what?" I mean, if we were to fight, what would I get out of it? Would I get my apartment back? Would I be able to pay the bills? MASTER MIND Well, what about your mentor? TITAN Tell you the truth? He was kind of a dick. I mean, being a hero is dandy and all, but it's volunteer work. Now you've always had the right take on all this. I mean, when you rob a bank or take over the diamond exchange you get something out of it. I mean, when you don't get caught, which, no offense, isn't very often. And that brings me to what I wanted to propose to you: Who could catch you if I'm by your side? Perplexed by his proposal, Master Mind just stares at Titan awe-struck. MASTER MIND You want to team-up? 77. TITAN You got the brains, I got the brawn. We could even call ourselves that: `Brain' and `Brawn'. Look at this. Titan picks up a piece of POSTER BOARD off the floor and shows it to Master Mind. TITAN (CONT'D) I even designed us some new costumes. The picture is crudely drawn with magic markers and crayons. A big headed man (Master Mind) is standing on a plate of grass in a blue costume with a picture of a brain on his chest. Next to him, is a picture of Titan in a red costume with a black cape, but his chest is mysteriously blank. Titan proudly points to the two figures. TITAN (CONT'D) See, you'd be brain, so you got a little one on your costume, and then I'll have brawn on mine...once I figure out the best, you know, visual interpretation of it. What do you think? MASTER MIND What do I think? Master Mind shakes his head tiredly. MASTER MIND (CONT'D) I think you're probably the biggest idiot I've ever met. I mean, I can't believe you. All your gifts, all your powers, and all you want to use them for is your own financial fulfillment. You know what? Your kind of people make me sick. Titan puts down his drawing. TITAN I worked hard on this. MASTER MIND Oh - gee - I am so sorry! 78. Master Mind looks to Heaven in disgust. MASTER MIND (CONT'D) (under his breath) Of all the people to pick, it had to be this loser. This strikes a cord with Titan. TITAN Now, hold on. You're going a little too far. MASTER MIND I wish your mother said that to your father the night of your conception, they would have saved me a whole lot of heartache. TITAN Hey, I mean it. Master Mind gets right in his face. MASTER MIND Oh, yeah? What are you gonna do? EXT. HAL'S APARTMENT BUILDING - DAY We see Master Mind's body CRASH through the building and land in a DUMPSTER across the street. A car pulls up. The driver's door opens. Da Vinci gets out and runs to help his master. DA VINCI Master! MASTER MIND (O.S.) It hurts. Da Vinci peeks into the dumpster to see Master Mind's body cushioned by a stack of trash bags. DA VINCI What hurts? MASTER MIND It! The overly large henchmen starts to pull his master from the dumpster when they suddenly hear a voice from above. It's Titan peeking through the hole in his apartment wall. 79. TITAN I don't need you, I don't need anybody. I have the power to do and take anything I want. And now, I'm gonna take back everything this city owes me. Beware Metro City, it's time for Titan to collect. Titan shoots up into the air. TITAN (CONT'D) Oh, and from now on - I'M GONNA FLY THE WAY I WANT TO FLY! He takes a sitting position and flies away as if he were piloting an invisible jet. Master Mind climbs out of the dumpster and watches Titan disappear into the distance. DA VINCI How'd the plan go, boss? MASTER MIND I just made myself redundant, old friend. Da Vinci gives Master Mind a whiff. DA VINCI It's not that bad. INT. BANK - DAY Titan, with a happy bounce in his step, enters the bank. The last time he was here he thwarted a robbery. He looks nostalgic. A SECURITY GUARD shyly walks up to him like a kid meeting his TV idol. SECURITY GUARD Morning, Tighten. TITAN Morning. SECURITY GUARD Is there something we can do for you? 80. TITAN Oh, don't bother about me. I'm just here to make a withdrawal. Titan walks across the lobby, drawing stares of admiration from all. A little girl waves to him sweetly. He gives her a good- natured WINK as he heads straight for the vault. The security guard watches him enter and come out with a SACK OF CASH. Sure he must be misunderstanding what's going on, the security guard just stares at Titan as he passes by and out the door. The bank manager comes over to the guard. BANK MANAGER Say, did he just rob us? SECURITY GUARD Not sure. Sort of looks it, don't it? BANK MANAGER Yeah. SECURITY GUARD Should I, you know, stop him? BANK MANAGER Umm...Yeah. As the security guard exits the bank, the manager stares out the window. His eyes suddenly grow wide with terror. The guard's body suddenly smashes through the window, landing at the startled bank manager's feet. BANK MANAGER (CONT'D) (looking down at the guard) He did rob us, didn't he? CUT TO: TELEVISION "A Channel 7 News Special Report." Brad Helms wipes into view. 81. BRAD HELMS "Absolute power corrupts absolutely." When Lord Acton stated that, in a letter to Bishop Mandell Creighton in 1887, no one thought much about it, but today Metro City is reeling from that very prophecy. Tighten, who many thought of as our savior, has turned his back on the cause of justice. CUT TO: TITAN BEING EVIL - MONTAGE EXT. DIAMOND EXCHANGE - DAY Titan flies through the window of the building. He emerges seconds later laughing with his shirt full of booty. EXT. CITY STREET - DAY A woman screams from the window of a BURNING BUILDING. Titan flies up to her, grabs her fur coat and zooms off again, leaving the woman behind, slightly confused. EXT. OUTSIDE MARKET - DAY Titan steals a little boy's lollipop and gooses his mother. EXT. CITY STREET - DAY Dozens of people run through the streets apparently to get out of a downpour. We cut to the top of a building and see Titan ZIPPING UP HIS PANTS and laughing. INT. ABANDONED METRO CITY LIBRARY - NIGHT Master Mind paces back and forth in front of Plato and Da Vinci. PLATO I don't understand it. He seemed to have every characteristic we were looking for in a superhero. MASTER MIND Well, there's no use crying about it now, we must take action. I'm not going to play second fiddle to that crass buffoon. We must destroy Tighten. 82. PLATO It won't be easy. Uberman had a sense of decency and genuine love for the people. That was his weakness and was easily used against him. MASTER MIND Yes, but he possesses the same flaws present in Uberman's DNA - copper. It's like Benjamin Franklin always said: "If something works don't dick with it." EXT. BAR - DAY It looks like a war zone passed through here. Smashed police cars and debris lay everywhere. This seems to be the only building left untouched. INT. BAR - DAY A very tipsy Titan is sitting at the bar, looking deep into the bottom of his beer glass for answers. TITAN I can have anything I want. I'm like a god. The BARTENDER just listens as he wipes down a glass with a dirty rag. TITAN Point to any woman in this bar. I could have her in a second. He follows the bartender's gaze to THE ONLY OTHER PERSON THERE - A passed out, MIDDLE AGED HAG OF A BARFLY. TITAN (to Old Barfly) Hey, you wanna get with this? BARTENDER Buddy, what do you want? Titan carefully considers this for a moment. TITAN What do you want? That's the question, isn't it. I mean, what do you want when you can have everything? (MORE) 83. TITAN(cont'd) I suppose what I really want is to never be forgotten again. I want to do something that can never be cast aside or one-upped. I want a - what's it called? - A legacy. I want a legacy. Yeah, that's it. I like the sound that. BARTENDER I meant, what do you want to drink? TITAN Oh. EXT. BAR - LATER Titan stumbles out of the bar, carrying a large sack of money. MASTER MIND (O.S.) Your time has come to an end, Titan! He looks up to see Master Mind suddenly standing before him. TITAN What? MASTER MIND There can be only one master criminal in this city - and it's me. TITAN Really? Titan melodramatically throws up his arms. TITAN (CONT'D) I guess I should leave town then, huh? MASTER MIND I have a better idea - NOW! Two floors up Da Vinci releases a rope. A COPPER CAGE, like the one that caged Uberman, drops down on top of Titan. Titan nonchalantly surveys the cage. He walks to the bars, tries to pull them apart but can't. MASTER MIND (CONT'D) That's copper my good man. Your one weakness. (MORE) 84. MASTER MIND(cont'd) For all your amazing gifts of brawn you are no match for my intellect. Titan thinks for a moment. Suddenly, he starts to SPIN like a human top, DRILLING HIMSELF INTO THE STREET BELOW. As he disappears beneath the surface, we see a shocked look on Master Mind's face until Titan suddenly explodes out from under the street in front of him. Master Mind stares up at him, dumbfounded. Titan makes like he's going to strike him down, but stops. TITAN You know what? You're nothing but a bug. Not even worth my effort. He turns his back to Master Mind and continues down the street. Plato makes his way from the shadows to join his master. They watch Titan shrink into the distance. MASTER MIND He's not as dumb as I thought. PLATO I guess not...Funny, though. MASTER MIND What's funny? PLATO Funny Uberman didn't think of the same thing. EXT. HIGH ABOVE METRO CITY - DAY As Titan flies, he looks down at the rooftops of the city below. Suddenly, something catches his attention. HAL That's it! He stops, hovering in place as he looks down below. The buildings, which make up the heart of downtown Metro, are in a PERFECT TRIANGLE with a long strip of street leading up to it. It sorta looks like a bowling lane. 85. HAL Hello, Legacy. EXT. KINGPIN BOWLING - DAY Vinnie and his goons come running out as the hear a COMMOTION. They look up to see Titan ripping off THE GIANT BOWLING BALL from the top of the establishment. VINNIE Hey, that's my ball! INT. ROXANNE'S APARTMENT BUILDING - DAY Roxanne enters the building's elevator. Just before the door closes an ELDERLY WOMAN slides in. ELDERLY WOMAN That was a close one. Sixth floor, please. Roxanne smiles and goes to press the button. The elderly woman suddenly pulls out a SPRAY CAN, shooting a MYSTERIOUS-LOOKING MIST into Roxanne's face. She falls to the floor unconscious. INT. ROXANNE'S APARTMENT - DAY Roxanne awakens, finding herself tied to a chair in her living room. We hear NOISE from a TV in the background as she tries to adjust her vision. Slowly, the blurry figure before her becomes clear. It's Master Mind. He sits on her Lazy-Boy, reading what looks to be some kind of JOURNAL. MASTER MIND Wow, I always thought Uberman was your first superhero - but it looks like our little Roxanne dated a linebacker in college. ROXANNE That's my diary. MASTER MIND So it is. 86. ROXANNE It's personal. MASTER MIND Well, then I wouldn't leave it in your underwear drawer for just anyone to find. He throws the diary over his shoulder. ROXANNE What do you want? MASTER MIND I need your help. ROXANNE So you knock me out and tie me to a chair? MASTER MIND You're not going to like what I'm about to tell you. As she tries to shake off her headache from being knocked unconscious, Roxanne spots something on the TV. ON TELEVISION Brad Helms is huddled behind a van. BRAD HELMS It's chaos here in city square as city police - Behind him, Titan picks up a POLICE CAR and throws it at a PADDY WAGON. Both vehicles EXPLODE on impact. BACK TO SCENE ROXANNE He's really out of control. MASTER MIND Tell me about it. As if finally realizing something, Roxanne looks back at Master Mind. ROXANNE I should have known. You have something to do with this, don't you? - With Titan turning evil. 87. MASTER MIND Well, the evil thing he did by himself. My goal was to give MYSELF purpose by creating an intellectual sparring partner. ROXANNE (confused) You're talking like you made him. MASTER MIND And they call me Master Mind. ROXANNE Let me get this straight. You missed getting your ass kicked, so you made a new guy to kick your ass. That's pathetic. MASTER MIND In hindsight... Roxanne turns back to the TV to see a group of POLICE OFFICERS open fire on Titan. The bullets just deflect off his chest. ROXANNE And his powers, they're just like Uberman's. Why would he have his powers? MASTER MIND (almost ashamed) I had some left over from something. I infused him with it. ROXANNE YOU DID WHAT!? Driven by rage, she struggles to tear out of her bonds. She finally relents, giving Master Mind a look fueled by pure hatred. MASTER MIND Yeah, that's why I decided to tie you up. ROXANNE You did all this because you wanted purpose? MASTER MIND He seemed nice. 88. TELEVISION Titan is standing on top of a destroyed police car. He waves for the camera to zoom in on him. TITAN Closer. I want to show the people my real face. He pulls off his mask, revealing himself as Hal Stewart to the public for the first time. TITAN (CONT'D) Recognize me? BACK TO SCENE ROXANNE Hal Stewart. He's the guy we thought saved that woman and kid. Turned out he was just trying to save his own ass. MASTER MIND Yeah, good to know - NOW! TELEVISION Titan throws the mask over this shoulder and hops off the car. TITAN That's right, I'm really Hal Stewart. Former hero and bowling teacher at Kingpin's Bowling. BACK TO SCENE Roxanne turns to Master Mind, condescending him with her eyes. ROXANNE You picked a bowler to give super powers to? MASTER MIND It's a modest profession! TELEVISION 89. TITAN With my new found power, I've recently started to wonder what sort of legacy I should leave. Should I be a hero? I tried that once before - even saved a lady and her baby from being squashed. I was treated like a god until everyone started to shit on me - Okay, so what if I didn't "purposely" save them! He walks over and puts his hand on a large circular concrete shape just off camera. TITAN Well, I'm going to make something that can't be taken away from me. I'm going to create a permanent monument to my greatness. One that won't be so easily forgotten or erased. The camera pulls back revealing THE GIANT CONCRETE BOWLING BALL from Kingpin's. TITAN I intend to create a new category in the Guinness Book of World's Records by rolling the biggest strike in the history of bowling. He grabs the camera and points it to the DOWNTOWN BUILDINGS. We realize they are PERFECTLY ALIGNED IN BOWLING PIN FORMATION. TITAN My thanks to the city planning commission. This wouldn't have been possible without them. Titan grabs the camera so it's pointing back at him again. TITAN Tell your friends and family to tune in right here to this station at noon tomorrow. BACK TO SCENE ROXANNE My god, he's nuts. That'll destroy the whole business triangle. 90. Master Mind seems to be contemplating something - something bad. ROXANNE What? MASTER MIND My lair is in the direct path of the ball. ROXANNE Oh, real nice. Wouldn't want anything to happen to your hideout, would we? MASTER MIND You don't understand. I have certain equipment that's - that's highly unstable. ROXANNE What do you mean? MASTER MIND I sort of have a hydrogen reactor, okay? ROXANNE A HYDROGEN reactor? MASTER MIND It's experimental - only one in the world...Well, how do you think I power all my inventions? Someone like me can't pay for electricity. The bills would be outrageous. ROXANNE A REACTOR? MASTER MIND It creates 100 times the output of a nuclear one...If destroyed it could... ROXANNE - Vaporize the entire city! MASTER MIND (proudly) Pshaw...the whole eastern seaboard, actually. That little baby is amazing. I'm quite proud of it. (MORE) 91. MASTER MIND(cont'd) (off her deadpan reaction) I mean...we'd better find a way to stop him. Master Mind thinks a moment. MASTER MIND Did Uberman have a hideout? ROXANNE What? MASTER MIND A cave, a solitary fortress of some kind. C'mon, all heros have a place to hang their capes up in. Roxanne, it may be our only chance to find something, a clue, anything that could give us a fighting chance. ROXANNE It's under his house. MASTER MIND Whose house? Roxanne can hardly believe what she's telling him. ROXANNE Wayne Scott's. Master Mind shoots up out of his chair. MASTER MIND Wayne Scott? Uberman was Wayne Scott!? Wayne Scott, the wealthy philanthropist? But he disappeared - ROXANNE (interrupting) He disappeared just over two months ago when you killed him. Not only did you rid the world of a hero, you killed a kind, noble, generous man. Perhaps ashamed, the super villain hangs his head. Master Mind walks behind Roxanne and undoes her bonds. Rubbing her wrists, she watches him as he walks over to the door. 92. ROXANNE (CONT'D) Looks like you got what you always wanted. Uberman is out of the picture and Metro City is doomed. He grabs the door knob and stops, considering her words. MASTER MIND "Metro City doomed." You know, I never thought I'd say something like this, but here it goes - He slowly turns to her, CUE HEROIC MUSIC. MASTER MIND (CONT'D) Not if I have anything to say about it. EXT. WAYNE SCOTT'S MANSION - NIGHT Master Mind stands before the huge, Gothic structure in awe. MASTER MIND Such a dark place for one such as you. I wonder, underneath your noble deeds, what inner demons drove you to your endless crusade for justice? He walks to the front entrance. The double doors have been sealed shut with boards and nails. Master Mind begins to tear them off with his metal hand. INT. WAYNE SCOTT'S MANSION - NIGHT The doors opens. A beam of moonlight immediately pierces the darkness, forming an illuminated path into the heart of the manor. Master Mind enters. Covered in dust and cobwebs, the hall looks like a gigantic crypt. MASTER MIND Good lord, man. You've only been dead for two months. Master Mind walks, coming to a gigantic painted PORTRAIT OF WAYNE SCOTT. He stops to reverently admire the image of his fallen foe. 93. MASTER MIND (CONT'D) A disguise so simple, it's ingenious. No wonder I never caught on. Besides the Armani suit, there's nothing to hide the fact that this is the same person as Uberman. In the picture, he's even standing in the same cheesy, heroic pose with his fists on his hips. MASTER MIND (CONT'D) Two lives, yet in both you were an ideal. Perhaps it was you who was victorious in the end, old friend. A BONGING sound suddenly bellows through the dark halls. Master Mind comes to a grandfather clock standing next to a gigantic BOOKCASE. On the twelfth bong it falls silent. Master Mind begins to slide it across the floor until he hears a loud CLICK. The bookcase slides into the wall, REVEALING A HIDDEN PASSAGE. MASTER MIND (CONT'D) I'll miss how predictable you were. The passage way leads Master Mind to a WORKING ESCALATOR. Master Mind gets off the escalator to see a long hallway with stone walls. He begins to hear strange SOUNDS, almost like MUFFLED SCREAMS, coming from a doorway at the end of the hallway. Master Mind starts walking towards it. As he steps closer, he begins to notice a light cracking through the bottom of the door. MASTER MIND (CONT'D) Hello? Anyone here...besides..all the BIG MEN who are with me now? Nothing. MASTER MIND (CONT'D) (to himself) What's the worst you're gonna find? (MORE) 94. MASTER MIND(cont'd) The man was a boy scout, not a serial killer. He opens the door to his immediate amazement. It's some kind of screening room. A PROJECTOR shoots an image onto A DIRTY WHITE SCREEN hanging on the wall. BEER CANS litter the floor; a table in front of a ripped-up couch is covered in discarded snack goods; and a Kiss Pinball machine stands in the far corner next to a CLOSED DOOR. Master Mind turns his attention to the action on the screen. SCREEN A woman dressed in a leather DOMINATRIX OUTFIT is whipping an overweight man lying on a swing-like device with his butt sticking out. DOMINATRIX IN FILM YOU ARE A WORM! She whips him three times. The man CRIES out in pain. FAT MAN IN FILM PINEAPPLE!!! PINEAPPLE!!! Master Mind's eyes are transfixed on the disturbing imagery. The door by the pinball machine suddenly swings open. WAYNE SCOTT, dressed in raggedy sweats, steps into the room carrying a CAN OF BEER and a bowl of JIFFY-POP. Master Mind cannot believe his horrified eyes. MASTER MIND Ahhhhhh! Wayne Scott is just as startled. WAYNE SCOTT Jesus! He drop his drink and snack to the floor. The two men stare at each other as they struggle to regain their normal breathing patterns. Wayne Scott walks over to the couch, brushes off a thick layer of chip crumbs, and sits down. WAYNE SCOTT (CONT'D) What the hell are you doing here? 95. MASTER MIND I might just ask you the same question. I had thought I incinerated you. WAYNE SCOTT You scared the bejesus out of me. How'd you figure out I was still alive? Wait, how do you know my identity!? MASTER MIND Roxanne told me. As for your ruse, I forgot to line the bottom of the copper cage - Somebody pointed that out to me recently. Figured if they could do it, so could you. But one thing I couldn't figure out - WAYNE SCOTT The skeleton? Something I "borrowed" from a medical school a few months before. MASTER MIND A few months? How long had you been planning this? WAYNE SCOTT I always planned to retire - eventually. I mean, come on, you can't do this sort of thing in your fifties. You'd just look ridiculous. The pieces of the puzzle appear to be coming together in Master Mind's head. MASTER MIND I see it all so clearly now. INT. MASTER MIND'S HYDROFOIL - FLASHBACK Master Mind and his minions cover their eyes as the observatory explodes. MASTER MIND (CONT'D - V.O.) You must have done it just seconds before the observatory exploded. 96. INT. OBSERVATORY - FLASHBACK Similar to what Titan did, Uberman bores out from under the cage. MASTER MIND (CONT'D - V.O.) You bore out from under the cage. Then, using your Uber-Speed, - EXT. OBSERVATORY - FLASHBACK Running in a blur-like haze, Uberman screeches to a halt in front of some bushes. MASTER MIND (CONT'D - V.O.) - you made your way to safety, where you had the skeleton safely hidden away somewhere. EXT OBSERVATORY - SKY - DAY Uberman soars high above the clouds. He looks down at the observatory, which is a mere speck in the distance. MASTER MIND (CONT'D - V.O) (CONT'D) Then you must have flown to a safe distance and waited for the explosion, then... Just as the observatory explodes Uberman aims and throws the SKELETON like a javelin. It soars through the air like a missile, tearing through the flames of the explosion, and crashing right into the windshield of Master Mind's hydrofoil. END OF FLASHBACK Wayne stares at Master Mind, clearly impressed. WAYNE Man, you ARE smart. MASTER MIND But why fake your death? Why go through all of it? You could have just quit. WAYNE SCOTT But the responsibility would still be there. (MORE) 97. WAYNE SCOTT(cont'd) A cop can retire and stop handing out speeding tickets - but people expect more from superheroes. I tell you, a volcano couldn't erupt in Zimbabwe without everyone expecting me to do something about it. I figured, out of sight, out of mind. MASTER MIND And Wayne Scott? Why did he have to disappear? WAYNE SCOTT Both of my lives have so much baggage. It's time for new baggage, you know? Master Mind's is absolutely flabbergasted. MASTER MIND I just can't believe it. This whole time you've been in hiding while a force of great evil is tearing your city apart? Wayne rises to his feet, waving his hands for Master Mind to say no more. WAYNE SCOTT I don't want to hear about it. That's why I don't have a television in here to remind me of all the things I SHOULD be doing. Hell, I could get a wife to do that. MASTER MIND There's a demented supervillain out there about to destroy our - I mean, your city. Wayne shrugs indifferently. MASTER MIND You're really going to do nothing? WAYNE SCOTT Good and evil have a way of balancing themselves out. If this guy is as bad as you say, somebody will rise up to fight him. It's just the order of things. You found me, didn't you? 98. Wayne puts a condescending hand on Master Mind's shoulder. WAYNE SCOTT (CONT'D) I know it's hard, but you'll find someone else someday. He then starts walking to the door. MASTER MIND You're the only one who can stop him. Wayne turns around. WAYNE SCOTT Couldn't if I wanted to. Gotta a plane to catch. MASTER MIND A plane? WAYNE SCOTT Going to Barbados for a little change in climate. Now, if you'll excuse me, I got to go pack. He reads the still defeated look on Master Mind's face. WAYNE SCOTT (CONT'D) You were a good foe. I'm sorry if I've let you down. If it makes a difference, you were the best foe a hero could ask for. MASTER MIND Not smart enough to come up with a full-proof trap. WAYNE SCOTT Well, you did almost have me when you figured out my weakness was copper. Now that made me sweat a little. Took me way too long to drill out from under that cage. MASTER MIND I got lucky. WAYNE SCOTT Anyway, it's a good thing for my sake that I could always count on you for an out. 99. MASTER MIND (suddenly confused) What do you mean? WAYNE SCOTT C'mon, we always threw each other a couple of bones. You would always leave me an out in one of your `full-proof' traps, and I'd never had you incarcerated at a penitentiary that you couldn't eventually escape from. It kept our little game going. Master Mind seems deflated. MASTER MIND Game? - Was that all this ever was to you? You know, I was trying my best every time I fought you. Those `outs' as you call them were unintentional. WAYNE SCOTT Oh. MASTER MIND I guess I was never really a match for you, was I? Wayne shrugs. MASTER MIND (CONT'D) (thoughtfully) Then how can I expect to be one for Titan? A beaten man, Master Mind heads for the door, but stops and turns around. MASTER MIND (CONT'D) What about Roxanne? Wayne unleashes an exhausted sigh. WAYNE SCOTT I think we both got what we wanted out of our relationship. She got a career out of me, and I got plenty of other things out of her. But I'm ready to move on to greener pastures. 100. Master Mind's steel hand clinches into a fist at his side. Wayne's oblivious to this. MASTER MIND I guess I wasn't the villain I thought I was, and you...you weren't the hero I thought you were. He turns to make his exit when he suddenly sees ROXANNE STANDING IN THE DOOR FRAME. Wayne is almost at a loss for words. WAYNE SCOTT Roxanne! How long have you been... ROXANNE Long enough. Roxanne looks at Master Mind. ROXANNE (CONT'D) Don't you have something else you can go do? Master Mind leaves Roxanne and Wayne facing each other in silence. EXT. ANOTHER BAR - DAY Titan emerges with Brad and Frank. He's holding a BEER CAN and a bag of PORK RINDS. TITAN Alright, I want this whole thing to look ESPN professional, understand? A distant MECHANIZED RUMBLE can be heard. The noise rises, signaling the approach of something powerful. Titan and his crew walk out to the center of the plaza as the sound becomes almost deafening. A TANK TRACK as it moves over the street. We PULL BACK to see a whole line of TANKS rolling along the street. PLAZA From the five streets branching off the plaza, a dozen tanks roll toward Titan. 101. Titan turns to Brad and Frank. TITAN (CONT'D) You guys are about to get some good footage. I might need a little room, though. Brad and Frank look at each other and run to take cover behind a nearby building. Meanwhile, Titan nonchalantly sips from his beer as the tanks begin to surround them. FEEDBACK belts out of one of the tank's loudspeaker's, causing Titan to do a mock wince. TANK LOUDSPEAKER Titan, we have orders from the city of Metro to take you into custody. If you do not give your self up willingly, we will be forced to open fire. There's a long pause as no one says anything. TANK LOUDSPEAKER What is your answer? Titan takes a sip of his beverage and UNLEASHES A GIGANTIC BURP - The shockwave of which sends several of the tanks flying into a nearby building. Two of the remaining tanks close in on the villain. Both have him dead to rights at point-blank range with their massive guns. Titan sets down his beer, then calmly plugs a fist into each barrel. They FIRE. The FORCE OF THE BLAST SENDS THEM BOTH FLYING IN OPPOSITE DIRECTIONS where they CRASH into nearby buildings. Titan bends down and pick his beet back up. TITAN (to beer) Miss me? Titan is suddenly bombarded by a massive barrage of machine- gun fire. The force sends him flying into the windshield of a nearby car. 102. He looks up to see an APACHE ASSAULT COPTER. It's nose- mounted GATLING-GUN is turning toward him. Titan gets up to his feet and looks down at his beer can. The bottom of it was blown apart in the blast. TITAN (CONT'D) Didn't mean to get you involved in all of this. He stared daggers up at the helicopter pilot just as the gun gets a bead on him. TITAN (CONT'D) Hey, man! You killed my suds! Titan throws the can up and slaps it with the palm of his hand. It flies with so much force it knocks the helicopter blade clean off. The rest of the Apache crashes to the street like a car dropped off a building. TITAN (CONT'D) That's one was for you, beer. Titan salutes the wreckage and walks away to find Brad and Frank still hiding behind the building. TITAN Guys, please tell me you got that last bit. BRAD HELMS Huh? TITAN You're kidding me. I give you my sexiest moves and you mean to tell me it was for nothing? BRAD HELMS We were afraid something might hit us. TITAN Looks like I've given the story of the century to the wrong man. He thinks about this for a moment, then it hits him. 103. TITAN Wait. What about that other reporter. Blond. Not so lumpy on the topper half, but killer legs. BRAD HELMS Roxanne. You want Roxanne. She's a much better reporter than I am. You want her. TITAN Where can I find her. FRANK We're actually not supposed to give out that sort of information. BRAD HELMS 1314 Mockingbird Lane. I believe she lives in a penthouse. TITAN You've been very helpful. He tosses Brad over his shoulder like a discarded ice cream cone. In the faint distance we see him splash down in the middle of the Metro City river. INT. ABANDONED METRO CITY LIBRARY - DAY Master Mind, pacing anxiously as Plato and Da Vinci pack boxes. Obviously Master Mind is going on the lamb. MASTER MIND Hurry, we must be on our way as soon as possible. DA VINCI Master, why must we flee? MASTER MIND I told you, Titan is too powerful. If he's set on destroying us, there's precious little we could do about it. DA VINCI Where are we going? 104. MASTER MIND To another city, someplace with a shitload of superheroes to fight. We'll start over, we'll go back to doing what we do best. PLATO With our tails between our legs? The old Master Mind would never have let this comment slip by, but as we have seen, he's not the same man. MASTER MIND Plato, do you have a better plan?! Master Mind's cell phone rings. He turns in shame from his men and answers it. MASTER MIND (CONT'D) Hello...Roxanne? INT. ROXANNE'S APARTMENT Roxanne paces back and forth on the phone. ROXANNE What are you going to do about Tighten? INTERCUT between Master Mind and Roxanne on phone. MASTER MIND Right now I'm packing, later I'll have a snack on the train. ROXANNE You're running away? MASTER MIND In a word - yes. ROXANNE You created this monster... MASTER MIND I didn't create this - the god's of irony did and I am eating the crow I so richly deserve. ROXANNE There's no time for self pity. 105. MASTER MIND I'll make the time. Roxanne can't believe what she's hearing. MASTER MIND (CONT'D) You can leave with us. You'll be safe. ROXANNE I'm not going anywhere. MASTER MIND Will you listen to me, no one can stop him. ROXANNE You have to try. The city needs your help. MASTER MIND I'm afraid you have an inflated opinion of me. ROXANNE What the hell's happened to you? The Master Mind I knew would never have run from a fight even though he knew deep in his heart that he didn't have a chance in hell of winning it. It was your best quality. You need to be that man right now...I... MASTER MIND What? ROXANNE (heart felt) I believe in you. Master Mind is taken aback, in a good way. But he catches himself before the words swell his heart. MASTER MIND Sweet words, but that man is dead. Please, Roxanne, just come with me. ROXANNE No...I guess you are a coward after all. Suddenly, there's a loud crash. 106. Roxanne looks up to see a huge hunk of her ceiling has been completely ripped off. Titan is flying above, holding the debris as casually as if it were a paper plate at a barbecue. He looks down at her and smiles. TITAN Man, have I got a story for you. Master Mind can hears Titan's familiar laugh from his side of the line. MASTER MIND Roxanne? Roxanne? EXT. KINGPIN BOWLING - DAY Titan is standing in front of the bowling alley, trying to decide on an appropriate pose for the occasion. TITAN What pose would be best? The corny folded arms thing? He demonstrates, arching his chin proudly in the air. TITAN Or maybe on the hips, like this. It's the classic Superman pose, only not as masculine. TITAN No, makes me look like a flamer pirate. As Titan starts to fix his hair in the window, Frank pretends to fix the lens on his camera as he speaks to Roxanne. FRANK (whispering) Shouldn't we be making a run for it right about now? ROXANNE (whispering) The guy can outrun bullets. I don't think either one of us is in that kind of shape. TITAN She's right, Frank. 107. Frank looks up, stunned that Titan could have possibly heard him. TITAN Also got super hearing. I promise not to keep the both of you long, but you'll thank me when this is all over. Frank and Roxanne exchange helpless expressions. INT. ABANDONED METRO CITY LIBRARY - DAY Master Mind reverently stares up at the painted portrait of his father. MASTER MIND Dad, it's me... (he looks around to make sure no one can hear) ...Bubsy. I know we haven't talked in a while, and I'm sorry. It's been a little crazy trying to live up to a legacy. The painting's menacing stare seems to reach into his very soul. MASTER MIND Anyway...You raised me to be the worst that I could possibly be. And I've tried to live up to that as best as I could - even dropping out of dentistry school like you wanted me to. But I'm about to do something now that would really piss you off. I'm going to go against everything you ever taught me. I hope...I hope that maybe you'll look down at what I'm about to do as not so much a good deed, but more like the outright defiance of a hateful and ungrateful, son. If you could do that, then maybe - in your own little way - you could - for probably the first time - find a reason to be proud of me. He looks back up at the picture. Is it our imagination, or does the painting's stare suddenly seem even angrier? 108. MASTER MIND Well...either way, you're probably going to see me real soon. (calling over his shoulder) Men? Plato and Da Vinci suddenly stop what they're doing and look up at him. PLATO AND DA VINCI Yes Sir? MASTER MIND Stop packing. Our work is not finished here. PLATO AND DA VINCI YES SIR! TELEVISION A news report shows an aerial shot of Titan setting the giant ball down in the middle of a vacant city street. REPORTER We interrupt your regular afternoon programming to show you live footage of a potential dangerous situation in downtown Metro. The former hero knows as Titan is placing what appears to be a giant ball... INT. ABANDONED METRO CITY LIBRARY - CONTINUOUS Da Vinci stops in front of a television set, seeing the news report in progress. REPORTER Hold on...It appears our own Roxanne Ritchi is somehow at the scene. We now go to her with a live report. DA VINCI Sir, I think you should see this! CUT TO: 109. EXT. CITY STREET - DAY Roxanne is standing in front of a camera with a mike in her hand. ROXANNE I'm here with the cause of the destruction in Metro City. He has kidnapped me and a cameraman to chronicle what he refers to as the creation of a monument to his invincibility and overall "Asskickiness." He will use this giant concrete bowling ball to play the largest game of bowling ever using the buildings of downtown Metro City as his pins. Titan suddenly steps into the shot. TITAN And I'm going for the biggest strike ever. He leans into the camera. TITAN And you, Metro City, have a ringside seat as I cement my name in the anal of history. ROXANNE Annals. TITAN What? ROXANNE Nevermind. EXT. CITY STREET - MOMENTS LATER Titan holds up the massive bowling ball, lining up his shot. TITAN (in quiet professional bowler announcer voice) Like Tiger before him, a young savior has come to raise a sport from the ashes. Rookie Hal Stewart, a young man with a dream, realizing that dream here today, folks. (MORE) 110. TITAN(cont'd) One might click there heels and say "There's no place like home" upon finding themselves in such a fantasy. Well, Hal looks very much at home right were he is - with a ball in hand and glory in his sights. INT. METRO CITY LIBRARY - CONTINUOUS In the bowels of Master Mind's hideout, the HYDROGEN REACTOR glows and HUMS MENACINGLY. BACK TO SCENE Roxanne just stand helpless as Frank films away. ROXANNE Hal, I know everyone treated you like shit, but you don't have to do this. TITAN You're right. I don't HAVE to do anything. Isn't that cool? Titan lines up his shot. TITAN Here's one for the record books! Titan flies a few feet and rolls the ball down the main street. ROXANNE Her face is utter horror as she watches the inevitable destruction of Metro City. As the ball rolls - it demolishes everything in it's wake; cars, street lamps - windows shatter as the giant concrete sphere brushes along side buildings. TITAN He smiles in anticipation and uses "body English" to direct the ball. GIANT BOWLING BALL POV It's nearly halfway to its target. ROXANNE 111. She closes her eyes. Titan's smile fades. He looks around as if he hears something we don't. About two hundred feet in front of the first building a GIANT SPIDER WEB flies across the path of the ball, creating a defensive barrier. An enormous letter "M" is etched in the web's center. TITAN (CONT'D) What the...? The ball breaks through the web, but it's speed is greatly reduced. FRANK Look, what's that flying in the air? We suddenly see MASTER MIND FLYING OVER THE ROLLING BALL IN A JET PACK. He quickly pulls out his goo gun and starts laying down a path of sticky plasm to stop the destructive sphere's path. MASTER MIND C'mon, slow down Master Mind looks down to see the meter of the gun close to empty. MASTER MIND C'mon. The ball slows drastically then starts rolling to the side. It heads off an embankment and rolls harmlessly into a CANAL. MASTER MIND Gutterball! TITAN He's furious to say the least. TITAN YOU! Master Mind gives him a mocking grin. MASTER MIND Bowling? What other trailer park sports can you play? 112. TITAN You are becoming a real pain in my ass. I should have done this a long time ago. Titan lunges at his tormentor. Master Mind hits the BOOSTER on his jet pack and heads back toward the other side of the city with Titan in hot pursuit. MASTER MIND (CONT'D) (into walkie talkie) Plato, Da Vinci. Secure Roxanne, he's falling for it. ELSEWHERE A flustered Titan lands. He begins searching the city streets, but Master Mind is nowhere in sight. He turns upon hearing an EEKING sound to his left. Sitting on the ground is a CHIMPANZEE wearing a strange collar. It smiles at him. TITAN What the hell? From behind, Titan is immediately set upon by five more RADIO CONTROLLED APES. TITAN (CONT'D) GODAMNIT! The critters bite hop and hit Titan. As soon as he throws one off two more jump him. Titan breaks free and with his mighty breath blows them across the street into a fruit stand. With Titan out of their sight they begin to attack the fruit. MASTER MIND He's a block away frantically hitting his remote. MASTER MIND Shit! Stupid monkeys and their fruit. Titan flies away from the mad monkeys and lands to find Master Mind sitting on the ground wrapped in a long cape with only his head sticking out. 113. TITAN (CONT'D) No more games. Titan FIRES HIS LASER VISION AT MASTER MIND's CHEST. Master Mind pulls the cloak away to reveal a FIRE HYDRANT. Titan's EYE LASERS burn through the hydrant releasing a high pressure stream of water. Master Mind uses the last remote which dumps two tons of CEMENT mix into the truck. The crowd, police and news crews move in closer when Titan doesn't emerge. Master Mind drops his last remote and walks toward the truck cautiously. MASTER MIND Could it really be that easy-- - BOOM - The back of the truck explodes, throwing dust and concrete everywhere. When the dust clears we see and enraged Titan. MASTER MIND (CONT'D) Didn't think so. As the villain walks toward him, he pulls back his fist to give Master Mind the killing blow. TITAN If you don't mind, I'm going to punch trough your face now. Preparing himself for the end, Master Mind shuts his eyes as a SUDDEN GUST OF WIND BEGINS TO PICK UP. AS Titan goes to strike, a BLURRY FIGURE RUNS IN AND SNATCHES MASTER MIND OUT OF THE AWAY. Stunned, Master Mind begins to feel around his body as if to make sure everything's still in place. MASTER MIND I'm alive. He turns to see UBERMAN standing next to him. MASTER MIND Uberman? 114. The terrified bystanders start to notice the figure standing next to Master Mind. BYSTANDER 1 It's Uberman! BYSTANDER 2 Uberman's alive! BYSTANDER 3 We're saved! As the CROWD CHEERS, A confused Master Mind turns to Metro City's newly resurrected champion. MASTER MIND I thought. UBERMAN So did I. He puts a hand on Master Mind's shoulder. UBERMAN Thank you, old enemy. MASTER MIND For what? UBERMAN Showing me the error of my ways, Showing me I'm meant to be this city's savior, showing me that, while we can try, there is no running away from our true destiny. With that, UBERMAN IS STRICKEN BY A LASER BLAST, INSTANTLY TURNING HIM INTO A CHARRED HUMAN SKELETON. Master Mind turns to see Titan smiling with his STILL SMOKING EYES. TITAN Oh...Did I interrupt something? Master Mind turns to run, but, suddenly Titan is before him. TITAN Where you going, buddy? Titan grabs Master Mind by the collar and throws him across the street into a parked car. 115. TITAN (CONT'D) Welcome to Paintown. Population: you. Master Mind manages to stand on shaky legs. He seems in a daze, unable to move. Titan flies up in the air. TITAN (CONT'D) Time to finish this. With his fist front and center, Titan speeds toward Master Mind. He's like a human torpedo, coming in for the killing blow. Master Mind comes to his senses and puts up his hands. MASTER MIND WAIT!!! Titan screeches to a halt and stops just in front of him like an old Warner Bros cartoon. TITAN What? MASTER MIND Quick joke - What's the capital of Thailand? TITAN Huh - I don't know. MASTER MIND It's bang cock! In a sudden surge of strength, MASTER MIND PUNCHES TITAN IN THE GROIN. The once mighty man instantly drops to his knees, searching, with tears in his eyes, for the proper word to express the pain suddenly surging through his member. TITAN (CONT'D) Ow. Baffled, he looks up at Master Mind's hand and sees his gauntlet is now made ENTIRELY OUT OF COPPER. MASTER MIND So, I guess pennies are good for something. 116. He punches Titan in the face, knocking him out cold. Master Mind looks down on Titan with more than a little pride. Suddenly he hears something behind him. He spins to see the crowd making a strange noise - APPLAUSE. Roxanne comes up to him. The crowd starts to go wild and cheers for Master Mind. He's not sure what to make of it. ROXANNE Pretty strange, huh? MASTER MIND They're cheering for me. ROXANNE You saved them. You saved everybody. How's it feel? Master Mind looks at the smiles all around him. He begins to well up a little. MASTER MIND It's a...it's nice, you know? I usually don't get a lot of feedback. (whispering) But I also kind of caused all this. What happens when they find that out I was the cause of some of this? Roxanne looks at the cheering crowd, then back at Master Mind. ROXANNE What they don't know won't hurt them. MASTER MIND I guess that is all in the past. ROXANNE You're the hero. MASTER MIND I don't think I'd go that far...I mean I just...er... ROXANNE Master Mind? 117. MASTER MIND Yes? ROXANNE Stop talking. She kisses him. The crowd erupts in a cheer. TELEVISION The channel 7 he channel 7 logo zooms in followed by the title "Eye on Metro City." A picture of Master Mind smiling appears on the screen behind her. SAMANTHA SUMMERS Who's bad? Well, not Master Mind. It seems the former villain has done a career 180 after defeating Tighten and saving Metro City from certain enslavement. And here he is getting a full pardon by Metro City's Mayor, Steve Dent. Cut to ceremony on capital steps. The MAYOR is shaking Master Mind's metal gauntlet when it suddenly STARTS TO CRUSH HIS HAND. MAYOR Ahhh! Secret service men quickly start to draw their weapons and take aim at Master Mind. Realizing what's happening, he quickly lets the mayor's hand go and puts his arms in the air. MASTER MIND Sorry - Metal hand. Force of habit. He elbows the mayor. MASTER MIND (CONT'D) We're okay, right? Wincing, the mayor signals the men to put their guns down. WE CUT to video of Titan behind bars in a regular prison. 118. BRAD HELMS And what about Tighten? Is there a prison in existence that can hold this super powered menace? Well, the answer we found is no. A man in a white lab coat stands in front of Titan's cell just out of reach. PRISON SCIENTIST Of course normally he could break out of there anytime, but as you can see we've taken some special precautions. The news camera pans over see Titan in his cell wearing a copper JOCK STRAP with electrical cables hooked to it. Back to Samantha at the desk. BRAD HELMS What is a Hero? It seems never has that question needed to be asked more than it does tonight. We go to our very own Roxanne Ritchi, making her triumphant return to our news desk for the answer. Brad turns. The camera pans over to Roxanne who we now see has been sitting beside him. ROXANNE What is a hero? Well, there are many different kinds. There are those who hear a call, like the policeman or doctor, then there's the kind the public creates in their search for meaning and hope. Then, there are those who have the courage to change. DARK ALLEY - NIGHT A woman is being chased by two large thugs. They're gaining on her. She comes to a brick wall - a dead end. The thugs laugh. THUG #1 Hey, gimme that purse? 119. MASTER MIND (O.S) I don't think it would go with your outfit. The thugs turn around to see Master Mind, standing with his arms folded across his chest. THUG #2 It's Master Mind! Thug #1 draws a knife. THUG #1 So? It's not like he has any superpowers. Thug #1 puts his fingers to his mouth and whistles. Suddenly two more Thugs appear behind Master Mind. MASTER MIND I'm gonna give you a chance to surrender. THUG #1 Four against one. For a Master Mind, you're really bad at math. Master Mind throws a hand signal up in the air. Suddenly a giant robotic foot crashes down on the two men behind him. Thug #1 and Thug #2 drop their knives and raise their hands in the air. Master Mind looks up and waves. MASTER MIND Way to take out those two goons, guys! We see Da Vinci and Plato at the wheel of a gigantic robot. DA VINCI What two goons? The giant robot lifts its foot to check the bottom of it's sole. It KNOCKS OVER WATER TOWER in the process. The woman looks at Master Mind, horrified. 120. MASTER MIND (apologetically) Sorry, we're new at this. THE END

A list of practical projects that anyone can solve in any programming language (See solutions). These projects are divided into multiple categories, and each category has its own folder. To get started, simply fork this repo. CONTRIBUTING See ways of contributing to this repo. You can contribute solutions (will be published in this repo) to existing problems, add new projects, or remove existing ones. Make sure you follow all instructions properly. Solutions You can find implementations of these projects in many other languages by other users in this repo. Credits Problems are motivated by the ones shared at: Martyr2’s Mega Project List Rosetta Code Table of Contents Numbers Classic Algorithms Graph Data Structures Text Networking Classes Threading Web Files Databases Graphics and Multimedia Security Numbers Find PI to the Nth Digit - Enter a number and have the program generate PI up to that many decimal places. Keep a limit to how far the program will go. Find e to the Nth Digit - Just like the previous problem, but with e instead of PI. Enter a number and have the program generate e up to that many decimal places. Keep a limit to how far the program will go. Fibonacci Sequence - Enter a number and have the program generate the Fibonacci sequence to that number or to the Nth number. Prime Factorization - Have the user enter a number and find all Prime Factors (if there are any) and display them. Next Prime Number - Have the program find prime numbers until the user chooses to stop asking for the next one. Find Cost of Tile to Cover W x H Floor - Calculate the total cost of the tile it would take to cover a floor plan of width and height, using a cost entered by the user. Mortgage Calculator - Calculate the monthly payments of a fixed-term mortgage over given Nth terms at a given interest rate. Also, figure out how long it will take the user to pay back the loan. For added complexity, add an option for users to select the compounding interval (Monthly, Weekly, Daily, Continually). Change Return Program - The user enters a cost and then the amount of money given. The program will figure out the change and the number of quarters, dimes, nickels, pennies needed for the change. Binary to Decimal and Back Converter - Develop a converter to convert a decimal number to binary or a binary number to its decimal equivalent. Calculator - A simple calculator to do basic operators. Make it a scientific calculator for added complexity. Unit Converter (temp, currency, volume, mass, and more) - Converts various units between one another. The user enters the type of unit being entered, the type of unit they want to convert to, and then the value. The program will then make the conversion. Alarm Clock - A simple clock where it plays a sound after X number of minutes/seconds or at a particular time. Distance Between Two Cities - Calculates the distance between two cities and allows the user to specify a unit of distance. This program may require finding coordinates for the cities like latitude and longitude. Credit Card Validator - Takes in a credit card number from a common credit card vendor (Visa, MasterCard, American Express, Discoverer) and validates it to make sure that it is a valid number (look into how credit cards use a checksum). Tax Calculator - Asks the user to enter a cost and either a country or state tax. It then returns the tax plus the total cost with tax. Factorial Finder - The Factorial of a positive integer, n, is defined as the product of the sequence n, n-1, n-2, ...1, and the factorial of zero, 0, is defined as being 1. Solve this using both loops and recursion. Complex Number Algebra - Show addition, multiplication, negation, and inversion of complex numbers in separate functions. (Subtraction and division operations can be made with pairs of these operations.) Print the results for each operation tested. Happy Numbers - A happy number is defined by the following process. Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers. Display an example of your output here. Find the first 8 happy numbers. Number Names - Show how to spell out a number in English. You can use a preexisting implementation or roll your own, but you should support inputs up to at least one million (or the maximum value of your language's default bounded integer type if that's less). Optional: Support for inputs other than positive integers (like zero, negative integers, and floating-point numbers). Coin Flip Simulation - Write some code that simulates flipping a single coin however many times the user decides. The code should record the outcomes and count the number of tails and heads. Limit Calculator - Ask the user to enter f(x) and the limit value, then return the value of the limit statement Optional: Make the calculator capable of supporting infinite limits. Fast Exponentiation - Ask the user to enter 2 integers a and b and output a^b (i.e. pow(a,b)) in O(LG n) time complexity. Classic Algorithms Collatz Conjecture - Start with a number n > 1. Find the number of steps it takes to reach one using the following process: If n is even, divide it by 2. If n is odd, multiply it by 3 and add 1. Sorting - Implement two types of sorting algorithms: Merge sort and bubble sort. Closest pair problem - The closest pair of points problem or closest pair problem is a problem of computational geometry: given n points in metric space, find a pair of points with the smallest distance between them. Sieve of Eratosthenes - The sieve of Eratosthenes is one of the most efficient ways to find all of the smaller primes (below 10 million or so). Graph Graph from links - Create a program that will create a graph or network from a series of links. Eulerian Path - Create a program that will take as an input a graph and output either an Eulerian path or an Eulerian cycle, or state that it is not possible. An Eulerian path starts at one node and traverses every edge of a graph through every node and finishes at another node. An Eulerian cycle is an eulerian Path that starts and finishes at the same node. Connected Graph - Create a program that takes a graph as an input and outputs whether every node is connected or not. Dijkstra’s Algorithm - Create a program that finds the shortest path through a graph using its edges. Minimum Spanning Tree - Create a program that takes a connected, undirected graph with weights and outputs the minimum spanning tree of the graph i.e., a subgraph that is a tree, contains all the vertices, and the sum of its weights is the least possible. Data Structures Inverted index - An Inverted Index is a data structure used to create full-text search. Given a set of text files, implement a program to create an inverted index. Also, create a user interface to do a search using that inverted index which returns a list of files that contain the query term/terms. The search index can be in memory. Text Fizz Buzz - Write a program that prints the numbers from 1 to 100. But for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”. For numbers which are multiples of both three and five print “FizzBuzz”. Reverse a String - Enter a string and the program will reverse it and print it out. Pig Latin - Pig Latin is a game of alterations played in the English language game. To create the Pig Latin form of an English word the initial consonant sound is transposed to the end of the word and an ay is affixed (Ex.: "banana" would yield anana-bay). Read Wikipedia for more information on rules. Count Vowels - Enter a string and the program counts the number of vowels in the text. For added complexity have it report a sum of each vowel found. Check if Palindrome - Checks if the string entered by the user is a palindrome. That is that it reads the same forwards as backward like “racecar” Count Words in a String - Counts the number of individual words in a string. For added complexity read these strings in from a text file and generate a summary. Text Editor - Notepad-style application that can open, edit, and save text documents. Optional: Add syntax highlighting and other features. RSS Feed Creator - Given a link to RSS/Atom Feed, get all posts and display them. Quote Tracker (market symbols etc) - A program that can go out and check the current value of stocks for a list of symbols entered by the user. The user can set how often the stocks are checked. For CLI, show whether the stock has moved up or down. Optional: If GUI, the program can show green up and red down arrows to show which direction the stock value has moved. Guestbook / Journal - A simple application that allows people to add comments or write journal entries. It can allow comments or not and timestamps for all entries. Could also be made into a shoutbox. Optional: Deploy it on Google App Engine or Heroku or any other PaaS (if possible, of course). Vigenere / Vernam / Ceasar Ciphers - Functions for encrypting and decrypting data messages. Then send them to a friend. Regex Query Tool - A tool that allows the user to enter a text string and then in a separate control enter a regex pattern. It will run the regular expression against the source text and return any matches or flag errors in the regular expression. Networking FTP Program - A file transfer program that can transfer files back and forth from a remote web sever. Bandwidth Monitor - A small utility program that tracks how much data you have uploaded and downloaded from the net during the course of your current online session. See if you can find out what periods of the day you use more and less and generate a report or graph that shows it. Port Scanner - Enter an IP address and a port range where the program will then attempt to find open ports on the given computer by connecting to each of them. On any successful connections mark the port as open. Mail Checker (POP3 / IMAP) - The user enters various account information include web server and IP, protocol type (POP3 or IMAP), and the application will check for email at a given interval. Country from IP Lookup - Enter an IP address and find the country that IP is registered in. Optional: Find the Ip automatically. Whois Search Tool - Enter an IP or host address and have it look it up through whois and return the results to you. Site Checker with Time Scheduling - An application that attempts to connect to a website or server every so many minute or a given time and check if it is up. If it is down, it will notify you by email or by posting a notice on the screen. Classes Product Inventory Project - Create an application that manages an inventory of products. Create a product class that has a price, id, and quantity on hand. Then create an inventory class that keeps track of various products and can sum up the inventory value. Airline / Hotel Reservation System - Create a reservation system that books airline seats or hotel rooms. It charges various rates for particular sections of the plane or hotel. For example, first class is going to cost more than a coach. Hotel rooms have penthouse suites which cost more. Keep track of when rooms will be available and can be scheduled. Company Manager - Create a hierarchy of classes - abstract class Employee and subclasses HourlyEmployee, SalariedEmployee, Manager, and Executive. Everyone's pay is calculated differently, research a bit about it. After you've established an employee hierarchy, create a Company class that allows you to manage the employees. You should be able to hire, fire, and raise employees. Bank Account Manager - Create a class called Account which will be an abstract class for three other classes called CheckingAccount, SavingsAccount, and BusinessAccount. Manage credits and debits from these accounts through an ATM-style program. Patient / Doctor Scheduler - Create a patient class and a doctor class. Have a doctor that can handle multiple patients and set up a scheduling program where a doctor can only handle 16 patients during an 8 hr workday. Recipe Creator and Manager - Create a recipe class with ingredients and put them in a recipe manager program that organizes them into categories like desserts, main courses, or by ingredients like chicken, beef, soups, pies, etc. Image Gallery - Create an image abstract class and then a class that inherits from it for each image type. Put them in a program that displays them in a gallery-style format for viewing. Shape Area and Perimeter Classes - Create an abstract class called Shape and then inherit from it other shapes like diamond, rectangle, circle, triangle, etc. Then have each class override the area and perimeter functionality to handle each shape type. Flower Shop Ordering To Go - Create a flower shop application that deals in flower objects and use those flower objects in a bouquet object which can then be sold. Keep track of the number of objects and when you may need to order more. Family Tree Creator - Create a class called Person which will have a name, when they were born, and when (and if) they died. Allow the user to create these Person classes and put them into a family tree structure. Print out the tree to the screen. Threading Create A Progress Bar for Downloads - Create a progress bar for applications that can keep track of a download in progress. The progress bar will be on a separate thread and will communicate with the main thread using delegates. Bulk Thumbnail Creator - Picture processing can take a bit of time for some transformations. Especially if the image is large. Create an image program that can take hundreds of images and converts them to a specified size in the background thread while you do other things. For added complexity, have one thread handling re-sizing, have another bulk renaming of thumbnails, etc. Web Page Scraper - Create an application that connects to a site and pulls out all links, or images, and saves them to a list. Optional: Organize the indexed content and don’t allow duplicates. Have it put the results into an easily searchable index file. Online White Board - Create an application that allows you to draw pictures, write notes and use various colors to flesh out ideas for projects. Optional: Add a feature to invite friends to collaborate on a whiteboard online. Get Atomic Time from Internet Clock - This program will get the true atomic time from an atomic time clock on the Internet. Use any one of the atomic clocks returned by a simple Google search. Fetch Current Weather - Get the current weather for a given zip/postal code. Optional: Try locating the user automatically. Scheduled Auto Login and Action - Make an application that logs into a given site on a schedule and invokes a certain action and then logs out. This can be useful for checking webmail, posting regular content, or getting info for other applications and saving it to your computer. E-Card Generator - Make a site that allows people to generate their own little e-cards and send them to other people. Do not use Flash. Use a picture library and perhaps insightful mottos or quotes. Content Management System - Create a content management system (CMS) like Joomla, Drupal, PHP Nuke, etc. Start small. Optional: Allow for the addition of modules/addons. Web Board (Forum) - Create a forum for you and your buddies to post, administer and share thoughts and ideas. CAPTCHA Maker - Ever see those images with letters numbers when you signup for a service and then ask you to enter what you see? It keeps web bots from automatically signing up and spamming. Try creating one yourself for online forms. Files Quiz Maker - Make an application that takes various questions from a file, picked randomly, and puts together a quiz for students. Each quiz can be different and then reads a key to grade the quizzes. Sort Excel/CSV File Utility - Reads a file of records, sorts them, and then writes them back to the file. Allow the user to choose various sort style and sorting based on a particular field. Create Zip File Maker - The user enters various files from different directories and the program zips them up into a zip file. Optional: Apply actual compression to the files. Start with Huffman Algorithm. PDF Generator - An application that can read in a text file, HTML file, or some other file and generates a PDF file out of it. Great for a web-based service where the user uploads the file and the program returns a PDF of the file. Optional: Deploy on GAE or Heroku if possible. Mp3 Tagger - Modify and add ID3v1 tags to MP3 files. See if you can also add in the album art into the MP3 file’s header as well as other ID3v2 tags. Code Snippet Manager - Another utility program that allows coders to put in functions, classes, or other tidbits to save for use later. Organized by the type of snippet or language the coder can quickly lookup code. Optional: For extra practice try adding syntax highlighting based on the language. Databases SQL Query Analyzer - A utility application in which a user can enter a query and have it run against a local database and look for ways to make it more efficient. Remote SQL Tool - A utility that can execute queries on remote servers from your local computer across the Internet. It should take in a remote host, user name, and password, run the query and return the results. Report Generator - Create a utility that generates a report based on some tables in a database. Generates sales reports based on the order/order details tables or sums up the day's current database activity. Event Scheduler and Calendar - Make an application that allows the user to enter a date and time of an event, event notes, and then schedule those events on a calendar. The user can then browse the calendar or search the calendar for specific events. Optional: Allow the application to create re-occurrence events that reoccur every day, week, month, year, etc. Budget Tracker - Write an application that keeps track of a household’s budget. The user can add expenses, income, and recurring costs to find out how much they are saving or losing over a period of time. Optional: Allow the user to specify a date range and see the net flow of money in and out of the house budget for that time period. TV Show Tracker - Got a favorite show you don’t want to miss? Don’t have a PVR or want to be able to find the show to then PVR it later? Make an application that can search various online TV Guide sites, locate the shows/times/channels and add them to a database application. The database/website then can send you email reminders that a show is about to start and which channel it will be on. Travel Planner System - Make a system that allows users to put together their own little travel itinerary and keep track of the airline/hotel arrangements, points of interest, budget, and schedule. Graphics and Multimedia Slide Show - Make an application that shows various pictures in a slide show format. Optional: Try adding various effects like fade in/out, star wipe, and window blinds transitions. Stream Video from Online - Try to create your own online streaming video player. Mp3 Player - A simple program for playing your favorite music files. Add features you think are missing from your favorite music player. Watermarking Application - Have some pictures you want copyright protected? Add your own logo or text lightly across the background so that no one can simply steal your graphics off your site. Make a program that will add this watermark to the picture. Optional: Use threading to process multiple images simultaneously. Turtle Graphics - This is a common project where you create a floor of 20 x 20 squares. Using various commands you tell a turtle to draw a line on the floor. You have moved forward, left or right, lift or drop the pen, etc. Do a search online for "Turtle Graphics" for more information. Optional: Allow the program to read in the list of commands from a file. GIF Creator A program that puts together multiple images (PNGs, JPGs, TIFFs) to make a smooth GIF that can be exported. Optional: Make the program convert small video files to GIFs as well. Security Caesar cipher - Implement a Caesar cipher, both encoding, and decoding. The key is an integer from 1 to 25. This cipher rotates the letters of the alphabet (A to Z). The encoding replaces each letter with the 1st to 25th next letter in the alphabet (wrapping Z to A). So key 2 encrypts "HI" to "JK", but key 20 encrypts "HI" to "BC". This simple "monoalphabetic substitution cipher" provides almost no security, because an attacker who has the encoded message can either use frequency analysis to guess the key, or just try all 25 keys.

Welcome to my comprehensive course on python programming and ethical hacking. The course assumes you have NO prior knowledge in any of these topics, and by the end of it you'll be at a high intermediate level being able to combine both of these skills to write python programs to hack into computer systems exactly the same way that black hat hackers do. That's not all, you'll also be able to use the programming skills you learn to write any program even if it has nothing to do with hacking. This course is highly practical but it won't neglect the theory, we'll start with basics of ethical hacking and python programming and installing the needed software. Then we'll dive and start programming straight away. You'll learn everything by example, by writing useful hacking programs, no boring dry programming lectures. The course is divided into a number of sections, each aims to achieve a specific goal, the goal is usually to hack into a certain system! We'll start by learning how this system work and its weaknesses, then you'll lean how to write a python program to exploit these weaknesses and hack the system. As we write the program I will teach you python programming from scratch covering one topic at a time. By the end of the course you're going to have a number of ethical hacking programs written by yourself (see below) from backdoors, keyloggers, credential harvesters, network hacking tools, website hacking tools and the list goes on. You'll also have a deep understanding on how computer systems work, how to model problems, design an algorithm to solve problems and implement the solution using python. As mentioned in this course you will learn both ethical hacking and programming at the same time, here are some of the topics that will be covered in the course: Programming topics: Writing programs for python 2 and 3. Using modules and libraries. Variables, types ...etc. Handling user input. Reading and writing files. Functions. Loops. Data structures. Regex. Desiccation making. Recursion. Threading. Object oriented programming. Packet manipulation using scapy. Netfilterqueue. Socket programming. String manipulation. Exceptions. Serialisation. Compiling programs to binary executables. Sending & receiving HTTP requests. Parsing HTML. + more! Hacking topics: Basics of network hacking / penetration testing. Changing MAC address & bypassing filtering. Network mapping. ARP Spoofing - redirect the flow of packets in a network. DNS Spoofing - redirect requests from one website to another. Spying on any client connected to the network - see usernames, passwords, visited urls ....etc. Inject code in pages loaded by any computer connected to the same network. Replace files on the fly as they get downloaded by any computer on the same network. Detect ARP spoofing attacks. Bypass HTTPS. Create malware for Windows, OS X and Linux. Create trojans for Windows, OS X and Linux. Hack Windows, OS X and Linux using custom backdoor. Bypass Anti-Virus programs. Use fake login prompt to steal credentials. Display fake updates. Use own keylogger to spy on everything typed on a Windows & Linux. Learn the basics of website hacking / penetration testing. Discover subdomains. Discover hidden files and directories in a website. Run wordlist attacks to guess login information. Discover and exploit XSS vulnerabilities. Discover weaknesses in websites using own vulnerability scanner. Programs you'll build in this course: You'll learn all the above by implementing the following hacking programs mac_changer - changes MAC Address to anything we want. network_scanner - scans network and discovers the IP and MAC address of all connected clients. arp_spoofer - runs an arp spoofing attack to redirect the flow of packets in the network allowing us to intercept data. packet_sniffer - filters intercepted data and shows usernames, passwords, visited links ....etc dns_spoofer - redirects DNS requests, eg: redirects requests to from one domain to another. file_interceptor - replaces intercepted files with any file we want. code_injector - injects code in intercepted HTML pages. arpspoof_detector - detects ARP spoofing attacks. execute_command payload - executes a system command on the computer it gets executed on. execute_and_report payload - executes a system command and reports result via email. download_and_execute payload - downloads a file and executes it on target system. download_execute_and_report payload - downloads a file, executes it, and reports result by email. reverse_backdoor - gives remote control over the system it gets executed on, allows us to Access file system. Execute system commands. Download & upload files keylogger - records key-strikes and sends them to us by email. crawler - discovers hidden paths on a target website. discover_subdomains - discovers subdomains on target website. spider - maps the whole target website and discovers all files, directories and links. guess_login - runs a wordlist attack to guess login information. vulnerability_scanner - scans a target website for weaknesses and produces a report with all findings. As you build the above you'll learn: Setting up a penetration testing lab to practice hacking safely. Installing Kali Linux and Windows as virtual machines inside ANY operating system. Linux Basics. Linux terminal basics. How networks work. How clients communicate in a network. Address Resolution Protocol - ARP. Network layers. Domain Name System - DNS. Hypertext Transfer Protocol - HTTP. HTTPS. How anti-virus programs work. Sockets. Connecting devices over TCP. Transferring data over TCP. How website work. GET & POST requests. And more! By the end of the course you're going to have programming skills to write any program even if it has nothing to do with hacking, but you'll learn programming by programming hacking tools! With this course you'll get 24/7 support, so if you have any questions you can post them in the Q&A section and we'll respond to you within 15 hours. Notes: This course is created for educational purposes only and all the attacks are launched in my own lab or against devices that I have permission to test. This course is totally a product of Zaid Sabih & zSecurity, no other organisation is associated with it or a certification exam. Although, you will receive a Course Completion Certification from Udemy, apart from that NO OTHER ORGANISATION IS INVOLVED. What you’ll learn 170+ videos on Python programming & ethical hacking Install hacking lab & needed software (on Windows, OS X and Linux) Learn 2 topics at the same time - Python programming & Ethical Hacking Start from 0 up to a high-intermediate level Write over 20 ethical hacking and security programs Learn by example, by writing exciting programs Model problems, design solutions & implement them using Python Write programs in Python 2 and 3 Write cross platform programs that work on Windows, OS X & Linux Have a deep understanding on how computer systems work Have a strong base & use the skills learned to write any program even if its not related to hacking Understand what is Hacking, what is Programming, and why are they related Design a testing lab to practice hacking & programming safely Interact & use Linux terminal Understand what MAC address is & how to change it Write a python program to change MAC address Use Python modules and libraries Understand Object Oriented Programming Write object oriented programs Model & design extendable programs Write a program to discover devices connected to the same network Read, analyse & manipulate network packets Understand & interact with different network layers such as ARP, DNS, HTTP ....etc Write a program to redirect the flow of packets in a network (arp spoofer) Write a packet sniffer to filter interesting data such as usernames and passwords Write a program to redirect DNS requests (DNS Spoofer) Intercept and modify network packets on the fly Write a program to replace downloads requested by any computer on the network Analyse & modify HTTP requests and responses Inject code in HTML pages loaded by any computer on the same network Downgrade HTTPS to HTTP Write a program to detect ARP Spoofing attacks Write payloads to download a file, execute command, download & execute, download execute & report .....etc Use sockets to send data over TCP Send data reliably over TCP Write client-server programs Write a backdoor that works on Windows, OS X and Linux Implement cool features in the backdoor such as file system access, upload and download files and persistence Write a remote keylogger that can register all keystrikes and send them by Email Interact with files using python (read, write & modify) Convert python programs to binary executables that work on Windows, OS X and Linux Convert malware to torjans that work and function like other file types like an image or a PDF Bypass Anti-Virus Programs Understand how websites work, the technologies used and how to test them for weaknesses Send requests towebsites and analyse responses Write a program that can discover hidden paths in a website Write a program that can map a website and discover all links, subdomains, files and directories Extract and submit forms from python Run dictionary attacks and guess login information on login pages Analyse HTML using Python Interact with websites using Python Write a program that can discover vulnerabilities in websites Are there any course requirements or prerequisites? Basic IT knowledge No Linux, programming or hacking knowledge required. Computer with a minimum of 4GB ram/memory Operating System: Windows / OS X / Linux Who this course is for: Anybody interested in learning Python programming Anybody interested in learning ethical hacking / penetration testing Instructor User photo Zaid Sabih Ethical Hacker, Computer Scientist & CEO of zSecurity My name is Zaid Al-Quraishi, I am an ethical hacker, a computer scientist, and the founder and CEO of zSecurity. I just love hacking and breaking the rules, but don’t get me wrong as I said I am an ethical hacker. I have tremendous experience in ethical hacking, I started making video tutorials back in 2009 in an ethical hacking community (iSecuri1ty), I also worked as a pentester for the same company. In 2013 I started teaching my first course live and online, this course received amazing feedback which motivated me to publish it on Udemy. This course became the most popular and the top paid course in Udemy for almost a year, this motivated me to make more courses, now I have a number of ethical hacking courses, each focusing on a specific field, dominating the ethical hacking topic on Udemy. Now I have more than 350,000 students on Udemy and other teaching platforms such as StackSocial, StackSkills and zSecurity. Instructor User photo z Security Leading provider of ethical hacking and cyber security training, zSecurity is a leading provider of ethical hacking and cyber security training, we teach hacking and security to help people become ethical hackers so they can test and secure systems from black-hat hackers. Becoming an ethical hacker is simple but not easy, there are many resources online but lots of them are wrong and outdated, not only that but it is hard to stay up to date even if you already have a background in cyber security. Our goal is to educate people and increase awareness by exposing methods used by real black-hat hackers and show how to secure systems from these hackers. Video course

An ANN is a model based on a collection of connected units or nodes called "artificial neurons", which loosely model the neurons in a biological brain. Each connection, like the synapses in a biological brain, can transmit information, a "signal", from one artificial neuron to another. An artificial neuron that receives a signal can process it and then signal additional artificial neurons connected to it. In common ANN implementations, the signal at a connection between artificial neurons is a real number, and the output of each artificial neuron is computed by some non-linear function of the sum of its inputs. The connections between artificial neurons are called "edges". Artificial neurons and edges typically have a weight that adjusts as learning proceeds. The weight increases or decreases the strength of the signal at a connection. Artificial neurons may have a threshold such that the signal is only sent if the aggregate signal crosses that threshold. Typically, artificial neurons are aggregated into layers. Different layers may perform different kinds of transformations on their inputs. Signals travel from the first layer (the input layer) to the last layer (the output layer), possibly after traversing the layers multiple times. The original goal of the ANN approach was to solve problems in the same way that a human brain would. However, over time, attention moved to performing specific tasks, leading to deviations from biology. Artificial neural networks have been used on a variety of tasks, including computer vision, speech recognition, machine translation, social network filtering, playing board and video games and medical diagnosis. Deep learning consists of multiple hidden layers in an artificial neural network. This approach tries to model the way the human brain processes light and sound into vision and hearing. Some successful applications of deep learning are computer vision and speech recognition.[68] Decision trees Main article: Decision tree learning Decision tree learning uses a decision tree as a predictive model to go from observations about an item (represented in the branches) to conclusions about the item's target value (represented in the leaves). It is one of the predictive modeling approaches used in statistics, data mining, and machine learning. Tree models where the target variable can take a discrete set of values are called classification trees; in these tree structures, leaves represent class labels and branches represent conjunctions of features that lead to those class labels. Decision trees where the target variable can take continuous values (typically real numbers) are called regression trees. In decision analysis, a decision tree can be used to visually and explicitly represent decisions and decision making. In data mining, a decision tree describes data, but the resulting classification tree can be an input for decision making. Support vector machines Main article: Support vector machines Support vector machines (SVMs), also known as support vector networks, are a set of related supervised learning methods used for classification and regression. Given a set of training examples, each marked as belonging to one of two categories, an SVM training algorithm builds a model that predicts whether a new example falls into one category or the other.[69] An SVM training algorithm is a non-probabilistic, binary, linear classifier, although methods such as Platt scaling exist to use SVM in a probabilistic classification setting. In addition to performing linear classification, SVMs can efficiently perform a non-linear classification using what is called the kernel trick, implicitly mapping their inputs into high-dimensional feature spaces. Illustration of linear regression on a data set. Regression analysis Main article: Regression analysis Regression analysis encompasses a large variety of statistical methods to estimate the relationship between input variables and their associated features. Its most common form is linear regression, where a single line is drawn to best fit the given data according to a mathematical criterion such as ordinary least squares. The latter is often extended by regularization (mathematics) methods to mitigate overfitting and bias, as in ridge regression. When dealing with non-linear problems, go-to models include polynomial regression (for example, used for trendline fitting in Microsoft Excel[70]), logistic regression (often used in statistical classification) or even kernel regression, which introduces non-linearity by taking advantage of the kernel trick to implicitly map input variables to higher-dimensional space. Bayesian networks Main article: Bayesian network A simple Bayesian network. Rain influences whether the sprinkler is activated, and both rain and the sprinkler influence whether the grass is wet. A Bayesian network, belief network, or directed acyclic graphical model is a probabilistic graphical model that represents a set of random variables and their conditional independence with a directed acyclic graph (DAG). For example, a Bayesian network could represent the probabilistic relationships between diseases and symptoms. Given symptoms, the network can be used to compute the probabilities of the presence of various diseases. Efficient algorithms exist that perform inference and learning. Bayesian networks that model sequences of variables, like speech signals or protein sequences, are called dynamic Bayesian networks. Generalizations of Bayesian networks that can represent and solve decision problems under uncertainty are called influence diagrams. Genetic algorithms Main article: Genetic algorithm A genetic algorithm (GA) is a search algorithm and heuristic technique that mimics the process of natural selection, using methods such as mutation and crossover to generate new genotypes in the hope of finding good solutions to a given problem. In machine learning, genetic algorithms were used in the 1980s and 1990s.[71][72] Conversely, machine learning techniques have been used to improve the performance of genetic and evolutionary algorithms.[73] Training models Usually, machine learning models require a lot of data in order for them to perform well. Usually, when training a machine learning model, one needs to collect a large, representative sample of data from a training set. Data from the training set can be as varied as a corpus of text, a collection of images, and data collected from individual users of a service. Overfitting is something to watch out for when training a machine learning model. Federated learning Main article: Federated learning Federated learning is an adapted form of distributed artificial intelligence to training machine learning models that decentralizes the training process, allowing for users' privacy to be maintained by not needing to send their data to a centralized server. This also increases efficiency by decentralizing the training process to many devices. For example, Gboard uses federated machine learning to train search query prediction models on users' mobile phones without having to send individual searches back to Google.[74] Applications There are many applications for machine learning, including: Agriculture Anatomy Adaptive websites Affective computing Banking Bioinformatics Brain–machine interfaces Cheminformatics Citizen science Computer networks Computer vision Credit-card fraud detection Data quality DNA sequence classification Economics Financial market analysis[75] General game playing Handwriting recognition Information retrieval Insurance Internet fraud detection Linguistics Machine learning control Machine perception Machine translation Marketing Medical diagnosis Natural language processing Natural language understanding Online advertising Optimization Recommender systems Robot locomotion Search engines Sentiment analysis Sequence mining Software engineering Speech recognition Structural health monitoring Syntactic pattern recognition Telecommunication Theorem proving Time series forecasting User behavior analytics In 2006, the media-services provider Netflix held the first "Netflix Prize" competition to find a program to better predict user preferences and improve the accuracy of its existing Cinematch movie recommendation algorithm by at least 10%. A joint team made up of researchers from AT&T Labs-Research in collaboration with the teams Big Chaos and Pragmatic Theory built an ensemble model to win the Grand Prize in 2009 for $1 million.[76] Shortly after the prize was awarded, Netflix realized that viewers' ratings were not the best indicators of their viewing patterns ("everything is a recommendation") and they changed their recommendation engine accordingly.[77] In 2010 The Wall Street Journal wrote about the firm Rebellion Research and their use of machine learning to predict the financial crisis.[78] In 2012, co-founder of Sun Microsystems, Vinod Khosla, predicted that 80% of medical doctors' jobs would be lost in the next two decades to automated machine learning medical diagnostic software.[79] In 2014, it was reported that a machine learning algorithm had been applied in the field of art history to study fine art paintings and that it may have revealed previously unrecognized influences among artists.[80] In 2019 Springer Nature published the first research book created using machine learning.[81] Limitations Although machine learning has been transformative in some fields, machine-learning programs often fail to deliver expected results.[82][83][84] Reasons for this are numerous: lack of (suitable) data, lack of access to the data, data bias, privacy problems, badly chosen tasks and algorithms, wrong tools and people, lack of resources, and evaluation problems.[85] In 2018, a self-driving car from Uber failed to detect a pedestrian, who was killed after a collision.[86] Attempts to use machine learning in healthcare with the IBM Watson system failed to deliver even after years of time and billions of dollars invested.[87][88] Bias Main article: Algorithmic bias Machine learning approaches in particular can suffer from different data biases. A machine learning system trained on current customers only may not be able to predict the needs of new customer groups that are not represented in the training data. When trained on man-made data, machine learning is likely to pick up the same constitutional and unconscious biases already present in society.[89] Language models learned from data have been shown to contain human-like biases.[90][91] Machine learning systems used for criminal risk assessment have been found to be biased against black people.[92][93] In 2015, Google photos would often tag black people as gorillas,[94] and in 2018 this still was not well resolved, but Google reportedly was still using the workaround to remove all gorillas from the training data, and thus was not able to recognize real gorillas at all.[95] Similar issues with recognizing non-white people have been found in many other systems.[96] In 2016, Microsoft tested a chatbot that learned from Twitter, and it quickly picked up racist and sexist language.[97] Because of such challenges, the effective use of machine learning may take longer to be adopted in other domains.[98] Concern for fairness in machine learning, that is, reducing bias in machine learning and propelling its use for human good is increasingly expressed by artificial intelligence scientists, including Fei-Fei Li, who reminds engineers that "There’s nothing artificial about AI...It’s inspired by people, it’s created by people, and—most importantly—it impacts people. It is a powerful tool we are only just beginning to understand, and that is a profound responsibility.”[99] Model assessments Classification of machine learning models can be validated by accuracy estimation techniques like the holdout method, which splits the data in a training and test set (conventionally 2/3 training set and 1/3 test set designation) and evaluates the performance of the training model on the test set. In comparison, the K-fold-cross-validation method randomly partitions the data into K subsets and then K experiments are performed each respectively considering 1 subset for evaluation and the remaining K-1 subsets for training the model. In addition to the holdout and cross-validation methods, bootstrap, which samples n instances with replacement from the dataset, can be used to assess model accuracy.[100] In addition to overall accuracy, investigators frequently report sensitivity and specificity meaning True Positive Rate (TPR) and True Negative Rate (TNR) respectively. Similarly, investigators sometimes report the false positive rate (FPR) as well as the false negative rate (FNR). However, these rates are ratios that fail to reveal their numerators and denominators. The total operating characteristic (TOC) is an effective method to express a model's diagnostic ability. TOC shows the numerators and denominators of the previously mentioned rates, thus TOC provides more information than the commonly used receiver operating characteristic (ROC) and ROC's associated area under the curve (AUC).[101] Ethics Machine learning poses a host of ethical questions. Systems which are trained on datasets collected with biases may exhibit these biases upon use (algorithmic bias), thus digitizing cultural prejudices.[102] For example, using job hiring data from a firm with racist hiring policies may lead to a machine learning system duplicating the bias by scoring job applicants against similarity to previous successful applicants.[103][104] Responsible collection of data and documentation of algorithmic rules used by a system thus is a critical part of machine learning. Because human languages contain biases, machines trained on language corpora will necessarily also learn these biases.[105][106] Other forms of ethical challenges, not related to personal biases, are more seen in health care. There are concerns among health care professionals that these systems might not be designed in the public's interest but as income-generating machines. This is especially true in the United States where there is a long-standing ethical dilemma of improving health care, but also increasing profits. For example, the algorithms could be designed to provide patients with unnecessary tests or medication in which the algorithm's proprietary owners hold stakes. There is huge potential for machine learning in health care to provide professionals a great tool to diagnose, medicate, and even plan recovery paths for patients, but this will not happen until the personal biases mentioned previously, and these "greed" biases are addressed.[107] Hardware Since the 2010s, advances in both machine learning algorithms and computer hardware have led to more efficient methods for training deep neural networks (a particular narrow subdomain of machine learning) that contain many layers of non-linear hidden units.[108] By 2019, graphic processing units (GPUs), often with AI-specific enhancements, had displaced CPUs as the dominant method of training large-scale commercial cloud AI.[109] OpenAI estimated the hardware compute used in the largest deep learning projects from AlexNet (2012) to AlphaZero (2017), and found a 300,000-fold increase in the amount of compute required, with a doubling-time trendline of 3.4 months.[110][111] Software Software suites containing a variety of machine learning algorithms include the following: Free and open-source so

# big-o-performance A simple html app to demonstrate performance costs of data structures. - Clone the project - Navigate to the root of the project in a termina or command prompt - Run 'npm install' - Run 'npm start' - Go to the URL specified in the terminal or command prompt to try out the app. # This app was created from the Create React App NPM. Below are instructions from that project. Below you will find some information on how to perform common tasks. You can find the most recent version of this guide [here](https://github.com/facebookincubator/create-react-app/blob/master/template/README.md). ## Table of Contents - [Updating to New Releases](#updating-to-new-releases) - [Sending Feedback](#sending-feedback) - [Folder Structure](#folder-structure) - [Available Scripts](#available-scripts) - [npm start](#npm-start) - [npm run build](#npm-run-build) - [npm run eject](#npm-run-eject) - [Displaying Lint Output in the Editor](#displaying-lint-output-in-the-editor) - [Installing a Dependency](#installing-a-dependency) - [Importing a Component](#importing-a-component) - [Adding a Stylesheet](#adding-a-stylesheet) - [Post-Processing CSS](#post-processing-css) - [Adding Images and Fonts](#adding-images-and-fonts) - [Adding Bootstrap](#adding-bootstrap) - [Adding Flow](#adding-flow) - [Adding Custom Environment Variables](#adding-custom-environment-variables) - [Integrating with a Node Backend](#integrating-with-a-node-backend) - [Proxying API Requests in Development](#proxying-api-requests-in-development) - [Deployment](#deployment) - [Now](#now) - [Heroku](#heroku) - [Surge](#surge) - [GitHub Pages](#github-pages) - [Something Missing?](#something-missing) ## Updating to New Releases Create React App is divided into two packages: * `create-react-app` is a global command-line utility that you use to create new projects. * `react-scripts` is a development dependency in the generated projects (including this one). You almost never need to update `create-react-app` itself: it’s delegates all the setup to `react-scripts`. When you run `create-react-app`, it always creates the project with the latest version of `react-scripts` so you’ll get all the new features and improvements in newly created apps automatically. To update an existing project to a new version of `react-scripts`, [open the changelog](https://github.com/facebookincubator/create-react-app/blob/master/CHANGELOG.md), find the version you’re currently on (check `package.json` in this folder if you’re not sure), and apply the migration instructions for the newer versions. In most cases bumping the `react-scripts` version in `package.json` and running `npm install` in this folder should be enough, but it’s good to consult the [changelog](https://github.com/facebookincubator/create-react-app/blob/master/CHANGELOG.md) for potential breaking changes. We commit to keeping the breaking changes minimal so you can upgrade `react-scripts` painlessly. ## Sending Feedback We are always open to [your feedback](https://github.com/facebookincubator/create-react-app/issues). ## Folder Structure After creation, your project should look like this: ``` my-app/ README.md index.html favicon.ico node_modules/ package.json src/ App.css App.js index.css index.js logo.svg ``` For the project to build, **these files must exist with exact filenames**: * `index.html` is the page template; * `favicon.ico` is the icon you see in the browser tab; * `src/index.js` is the JavaScript entry point. You can delete or rename the other files. You may create subdirectories inside `src`. For faster rebuilds, only files inside `src` are processed by Webpack. You need to **put any JS and CSS files inside `src`**, or Webpack won’t see them. You can, however, create more top-level directories. They will not be included in the production build so you can use them for things like documentation. ## Available Scripts In the project directory, you can run: ### `npm start` Runs the app in the development mode.<br> Open [http://localhost:3000](http://localhost:3000) to view it in the browser. The page will reload if you make edits.<br> You will also see any lint errors in the console. ### `npm run build` Builds the app for production to the `build` folder.<br> It correctly bundles React in production mode and optimizes the build for the best performance. The build is minified and the filenames include the hashes.<br> Your app is ready to be deployed! ### `npm run eject` **Note: this is a one-way operation. Once you `eject`, you can’t go back!** If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project. Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own. You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it. ## Displaying Lint Output in the Editor >Note: this feature is available with `react-scripts@0.2.0` and higher. Some editors, including Sublime Text, Atom, and Visual Studio Code, provide plugins for ESLint. They are not required for linting. You should see the linter output right in your terminal as well as the browser console. However, if you prefer the lint results to appear right in your editor, there are some extra steps you can do. You would need to install an ESLint plugin for your editor first. >**A note for Atom `linter-eslint` users** >If you are using the Atom `linter-eslint` plugin, make sure that **Use global ESLint installation** option is checked: ><img src="http://i.imgur.com/yVNNHJM.png" width="300"> Then make sure `package.json` of your project ends with this block: ```js { // ... "eslintConfig": { "extends": "./node_modules/react-scripts/config/eslint.js" } } ``` Projects generated with `react-scripts@0.2.0` and higher should already have it. If you don’t need ESLint integration with your editor, you can safely delete those three lines from your `package.json`. Finally, you will need to install some packages *globally*: ```sh npm install -g eslint babel-eslint eslint-plugin-react eslint-plugin-import eslint-plugin-jsx-a11y eslint-plugin-flowtype ``` We recognize that this is suboptimal, but it is currently required due to the way we hide the ESLint dependency. The ESLint team is already [working on a solution to this](https://github.com/eslint/eslint/issues/3458) so this may become unnecessary in a couple of months. ## Installing a Dependency The generated project includes React and ReactDOM as dependencies. It also includes a set of scripts used by Create React App as a development dependency. You may install other dependencies (for example, React Router) with `npm`: ``` npm install --save <library-name> ``` ## Importing a Component This project setup supports ES6 modules thanks to Babel. While you can still use `require()` and `module.exports`, we encourage you to use [`import` and `export`](http://exploringjs.com/es6/ch_modules.html) instead. For example: ### `Button.js` ```js import React, { Component } from 'react'; class Button extends Component { render() { // ... } } export default Button; // Don’t forget to use export default! ``` ### `DangerButton.js` ```js import React, { Component } from 'react'; import Button from './Button'; // Import a component from another file class DangerButton extends Component { render() { return <Button color="red" />; } } export default DangerButton; ``` Be aware of the [difference between default and named exports](http://stackoverflow.com/questions/36795819/react-native-es-6-when-should-i-use-curly-braces-for-import/36796281#36796281). It is a common source of mistakes. We suggest that you stick to using default imports and exports when a module only exports a single thing (for example, a component). That’s what you get when you use `export default Button` and `import Button from './Button'`. Named exports are useful for utility modules that export several functions. A module may have at most one default export and as many named exports as you like. Learn more about ES6 modules: * [When to use the curly braces?](http://stackoverflow.com/questions/36795819/react-native-es-6-when-should-i-use-curly-braces-for-import/36796281#36796281) * [Exploring ES6: Modules](http://exploringjs.com/es6/ch_modules.html) * [Understanding ES6: Modules](https://leanpub.com/understandinges6/read#leanpub-auto-encapsulating-code-with-modules) ## Adding a Stylesheet This project setup uses [Webpack](https://webpack.github.io/) for handling all assets. Webpack offers a custom way of “extending” the concept of `import` beyond JavaScript. To express that a JavaScript file depends on a CSS file, you need to **import the CSS from the JavaScript file**: ### `Button.css` ```css .Button { padding: 20px; } ``` ### `Button.js` ```js import React, { Component } from 'react'; import './Button.css'; // Tell Webpack that Button.js uses these styles class Button extends Component { render() { // You can use them as regular CSS styles return <div className="Button" />; } } ``` **This is not required for React** but many people find this feature convenient. You can read about the benefits of this approach [here](https://medium.com/seek-ui-engineering/block-element-modifying-your-javascript-components-d7f99fcab52b). However you should be aware that this makes your code less portable to other build tools and environments than Webpack. In development, expressing dependencies this way allows your styles to be reloaded on the fly as you edit them. In production, all CSS files will be concatenated into a single minified `.css` file in the build output. If you are concerned about using Webpack-specific semantics, you can put all your CSS right into `src/index.css`. It would still be imported from `src/index.js`, but you could always remove that import if you later migrate to a different build tool. ## Post-Processing CSS This project setup minifies your CSS and adds vendor prefixes to it automatically through [Autoprefixer](https://github.com/postcss/autoprefixer) so you don’t need to worry about it. For example, this: ```css .App { display: flex; flex-direction: row; align-items: center; } ``` becomes this: ```css .App { display: -webkit-box; display: -ms-flexbox; display: flex; -webkit-box-orient: horizontal; -webkit-box-direction: normal; -ms-flex-direction: row; flex-direction: row; -webkit-box-align: center; -ms-flex-align: center; align-items: center; } ``` There is currently no support for preprocessors such as Less, or for sharing variables across CSS files. ## Adding Images and Fonts With Webpack, using static assets like images and fonts works similarly to CSS. You can **`import` an image right in a JavaScript module**. This tells Webpack to include that image in the bundle. Unlike CSS imports, importing an image or a font gives you a string value. This value is the final image path you can reference in your code. Here is an example: ```js import React from 'react'; import logo from './logo.png'; // Tell Webpack this JS file uses this image console.log(logo); // /logo.84287d09.png function Header() { // Import result is the URL of your image return <img src={logo} alt="Logo" />; } export default function Header; ``` This works in CSS too: ```css .Logo { background-image: url(./logo.png); } ``` Webpack finds all relative module references in CSS (they start with `./`) and replaces them with the final paths from the compiled bundle. If you make a typo or accidentally delete an important file, you will see a compilation error, just like when you import a non-existent JavaScript module. The final filenames in the compiled bundle are generated by Webpack from content hashes. If the file content changes in the future, Webpack will give it a different name in production so you don’t need to worry about long-term caching of assets. Please be advised that this is also a custom feature of Webpack. **It is not required for React** but many people enjoy it (and React Native uses a similar mechanism for images). However it may not be portable to some other environments, such as Node.js and Browserify. If you prefer to reference static assets in a more traditional way outside the module system, please let us know [in this issue](https://github.com/facebookincubator/create-react-app/issues/28), and we will consider support for this. ## Adding Bootstrap You don’t have to use [React Bootstrap](https://react-bootstrap.github.io) together with React but it is a popular library for integrating Bootstrap with React apps. If you need it, you can integrate it with Create React App by following these steps: Install React Bootstrap and Bootstrap from NPM. React Bootstrap does not include Bootstrap CSS so this needs to be installed as well: ``` npm install react-bootstrap --save npm install bootstrap@3 --save ``` Import Bootstrap CSS and optionally Bootstrap theme CSS in the ```src/index.js``` file: ```js import 'bootstrap/dist/css/bootstrap.css'; import 'bootstrap/dist/css/bootstrap-theme.css'; ``` Import required React Bootstrap components within ```src/App.js``` file or your custom component files: ```js import { Navbar, Jumbotron, Button } from 'react-bootstrap'; ``` Now you are ready to use the imported React Bootstrap components within your component hierarchy defined in the render method. Here is an example [`App.js`](https://gist.githubusercontent.com/gaearon/85d8c067f6af1e56277c82d19fd4da7b/raw/6158dd991b67284e9fc8d70b9d973efe87659d72/App.js) redone using React Bootstrap. ## Adding Flow Flow typing is currently [not supported out of the box](https://github.com/facebookincubator/create-react-app/issues/72) with the default `.flowconfig` generated by Flow. If you run it, you might get errors like this: ```js node_modules/fbjs/lib/Deferred.js.flow:60 60: Promise.prototype.done.apply(this._promise, arguments); ^^^^ property `done`. Property not found in 495: declare class Promise<+R> { ^ Promise. See lib: /private/tmp/flow/flowlib_34952d31/core.js:495 node_modules/fbjs/lib/shallowEqual.js.flow:29 29: return x !== 0 || 1 / (x: $FlowIssue) === 1 / (y: $FlowIssue); ^^^^^^^^^^ identifier `$FlowIssue`. Could not resolve name src/App.js:3 3: import logo from './logo.svg'; ^^^^^^^^^^^^ ./logo.svg. Required module not found src/App.js:4 4: import './App.css'; ^^^^^^^^^^^ ./App.css. Required module not found src/index.js:5 5: import './index.css'; ^^^^^^^^^^^^^ ./index.css. Required module not found ``` To fix this, change your `.flowconfig` to look like this: ```ini [libs] ./node_modules/fbjs/flow/lib [options] esproposal.class_static_fields=enable esproposal.class_instance_fields=enable module.name_mapper='^\(.*\)\.css$' -> 'react-scripts/config/flow/css' module.name_mapper='^\(.*\)\.\(jpg\|png\|gif\|eot\|otf\|webp\|svg\|ttf\|woff\|woff2\|mp4\|webm\)$' -> 'react-scripts/config/flow/file' suppress_type=$FlowIssue suppress_type=$FlowFixMe ``` Re-run flow, and you shouldn’t get any extra issues. If you later `eject`, you’ll need to replace `react-scripts` references with the `<PROJECT_ROOT>` placeholder, for example: ```ini module.name_mapper='^\(.*\)\.css$' -> '<PROJECT_ROOT>/config/flow/css' module.name_mapper='^\(.*\)\.\(jpg\|png\|gif\|eot\|otf\|webp\|svg\|ttf\|woff\|woff2\|mp4\|webm\)$' -> '<PROJECT_ROOT>/config/flow/file' ``` We will consider integrating more tightly with Flow in the future so that you don’t have to do this. ## Adding Custom Environment Variables >Note: this feature is available with `react-scripts@0.2.3` and higher. Your project can consume variables declared in your environment as if they were declared locally in your JS files. By default you will have `NODE_ENV` defined for you, and any other environment variables starting with `REACT_APP_`. These environment variables will be defined for you on `process.env`. For example, having an environment variable named `REACT_APP_SECRET_CODE` will be exposed in your JS as `process.env.REACT_APP_SECRET_CODE`, in addition to `process.env.NODE_ENV`. These environment variables can be useful for displaying information conditionally based on where the project is deployed or consuming sensitive data that lives outside of version control. First, you need to have environment variables defined, which can vary between OSes. For example, let's say you wanted to consume a secret defined in the environment inside a `<form>`: ```jsx render() { return ( <div> <small>You are running this application in <b>{process.env.NODE_ENV}</b> mode.</small> <form> <input type="hidden" defaultValue={process.env.REACT_APP_SECRET_CODE} /> </form> </div> ); } ``` The above form is looking for a variable called `REACT_APP_SECRET_CODE` from the environment. In order to consume this value, we need to have it defined in the environment: ### Windows (cmd.exe) ```cmd set REACT_APP_SECRET_CODE=abcdef&&npm start ``` (Note: the lack of whitespace is intentional.) ### Linux, OS X (Bash) ```bash REACT_APP_SECRET_CODE=abcdef npm start ``` > Note: Defining environment variables in this manner is temporary for the life of the shell session. Setting permanent environment variables is outside the scope of these docs. With our environment variable defined, we start the app and consume the values. Remember that the `NODE_ENV` variable will be set for you automatically. When you load the app in the browser and inspect the `<input>`, you will see its value set to `abcdef`, and the bold text will show the environment provided when using `npm start`: ```html <div> <small>You are running this application in <b>development</b> mode.</small> <form> <input type="hidden" value="abcdef" /> </form> </div> ``` Having access to the `NODE_ENV` is also useful for performing actions conditionally: ```js if (process.env.NODE_ENV !== 'production') { analytics.disable(); } ``` ## Integrating with a Node Backend Check out [this tutorial](https://www.fullstackreact.com/articles/using-create-react-app-with-a-server/) for instructions on integrating an app with a Node backend running on another port, and using `fetch()` to access it. You can find the companion GitHub repository [here](https://github.com/fullstackreact/food-lookup-demo). ## Proxying API Requests in Development >Note: this feature is available with `react-scripts@0.2.3` and higher. People often serve the front-end React app from the same host and port as their backend implementation. For example, a production setup might look like this after the app is deployed: ``` / - static server returns index.html with React app /todos - static server returns index.html with React app /api/todos - server handles any /api/* requests using the backend implementation ``` Such setup is **not** required. However, if you **do** have a setup like this, it is convenient to write requests like `fetch('/api/todos')` without worrying about redirecting them to another host or port during development. To tell the development server to proxy any unknown requests to your API server in development, add a `proxy` field to your `package.json`, for example: ```js "proxy": "http://localhost:4000", ``` This way, when you `fetch('/api/todos')` in development, the development server will recognize that it’s not a static asset, and will proxy your request to `http://localhost:4000/api/todos` as a fallback. Conveniently, this avoids [CORS issues](http://stackoverflow.com/questions/21854516/understanding-ajax-cors-and-security-considerations) and error messages like this in development: ``` Fetch API cannot load http://localhost:4000/api/todos. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. ``` Keep in mind that `proxy` only has effect in development (with `npm start`), and it is up to you to ensure that URLs like `/api/todos` point to the right thing in production. You don’t have to use the `/api` prefix. Any unrecognized request will be redirected to the specified `proxy`. Currently the `proxy` option only handles HTTP requests, and it won’t proxy WebSocket connections. If the `proxy` option is **not** flexible enough for you, alternatively you can: * Enable CORS on your server ([here’s how to do it for Express](http://enable-cors.org/server_expressjs.html)). * Use [environment variables](#adding-custom-environment-variables) to inject the right server host and port into your app. ## Deployment By default, Create React App produces a build assuming your app is hosted at the server root. To override this, specify the `homepage` in your `package.json`, for example: ```js "homepage": "http://mywebsite.com/relativepath", ``` This will let Create React App correctly infer the root path to use in the generated HTML file. ### Now See [this example](https://github.com/xkawi/create-react-app-now) for a zero-configuration single-command deployment with [now](https://zeit.co/now). ### Heroku Use the [Heroku Buildpack for Create React App](https://github.com/mars/create-react-app-buildpack). You can find instructions in [Deploying React with Zero Configuration](https://blog.heroku.com/deploying-react-with-zero-configuration). ### Surge Install the Surge CLI if you haven't already by running `npm install -g surge`. Run the `surge` command and log in you or create a new account. You just need to specify the *build* folder and your custom domain, and you are done. ```sh email: email@domain.com password: ******** project path: /path/to/project/build size: 7 files, 1.8 MB domain: create-react-app.surge.sh upload: [====================] 100%, eta: 0.0s propagate on CDN: [====================] 100% plan: Free users: email@domain.com IP Address: X.X.X.X Success! Project is published and running at create-react-app.surge.sh ``` Note that in order to support routers that use html5 `pushState` API, you may want to rename the `index.html` in your build folder to `200.html` before deploying to Surge. This [ensures that every URL falls back to that file](https://surge.sh/help/adding-a-200-page-for-client-side-routing). ### GitHub Pages >Note: this feature is available with `react-scripts@0.2.0` and higher. Open your `package.json` and add a `homepage` field: ```js "homepage": "http://myusername.github.io/my-app", ``` **The above step is important!** Create React App uses the `homepage` field to determine the root URL in the built HTML file. Now, whenever you run `npm run build`, you will see a cheat sheet with a sequence of commands to deploy to GitHub pages: ```sh git commit -am "Save local changes" git checkout -B gh-pages git add -f build git commit -am "Rebuild website" git filter-branch -f --prune-empty --subdirectory-filter build git push -f origin gh-pages git checkout - ``` You may copy and paste them, or put them into a custom shell script. You may also customize them for another hosting provider. Note that GitHub Pages doesn't support routers that use the HTML5 `pushState` history API under the hood (for example, React Router using `browserHistory`). This is because when there is a fresh page load for a url like `http://user.github.io/todomvc/todos/42`, where `/todos/42` is a frontend route, the GitHub Pages server returns 404 because it knows nothing of `/todos/42`. If you want to add a router to a project hosted on GitHub Pages, here are a couple of solutions: * You could switch from using HTML5 history API to routing with hashes. If you use React Router, you can switch to `hashHistory` for this effect, but the URL will be longer and more verbose (for example, `http://user.github.io/todomvc/#/todos/42?_k=yknaj`). [Read more](https://github.com/reactjs/react-router/blob/master/docs/guides/Histories.md#histories) about different history implementations in React Router. * Alternatively, you can use a trick to teach GitHub Pages to handle 404 by redirecting to your `index.html` page with a special redirect parameter. You would need to add a `404.html` file with the redirection code to the `build` folder before deploying your project, and you’ll need to add code handling the redirect parameter to `index.html`. You can find a detailed explanation of this technique [in this guide](https://github.com/rafrex/spa-github-pages). ## Something Missing? If you have ideas for more “How To” recipes that should be on this page, [let us know](https://github.com/facebookincubator/create-react-app/issues) or [contribute some!](https://github.com/facebookincubator/create-react-app/edit/master/template/README.md)

The aim of this assignment is to have you do UDP socket client / server programming with a focus on two broad aspects : Setting up the exchange between the client and server in a secure way despite the lack of a formal connection (as in TCP) between the two, so that ‘outsider’ UDP datagrams (broadcast, multicast, unicast - fortuitously or maliciously) cannot intrude on the communication. Introducing application-layer protocol data-transmission reliability, flow control and congestion control in the client and server using TCP-like ARQ sliding window mechanisms. The second item above is much more of a challenge to implement than the first, though neither is particularly trivial. But they are not tightly interdependent; each can be worked on separately at first and then integrated together at a later stage. Apart from the material in Chapters 8, 14 & 22 (especially Sections 22.5 - 22.7), and the experience you gained from the preceding assignment, you will also need to refer to the following : ioctl function (Chapter 17). get_ifi_info function (Section 17.6, Chapter 17). This function will be used by the server code to discover its node’s network interfaces so that it can bind all its interface IP addresses (see Section 22.6). ‘Race’ conditions (Section 20.5, Chapter 20) You also need a thorough understanding of how the TCP protocol implements reliable data transfer, flow control and congestion control. Chapters 17- 24 of TCP/IP Illustrated, Volume 1 by W. Richard Stevens gives a good overview of TCP. Though somewhat dated for some things (it was published in 1994), it remains, overall, a good basic reference. Overview This assignment asks you to implement a primitive file transfer protocol for Unix platforms, based on UDP, and with TCP-like reliability added to the transfer operation using timeouts and sliding-window mechanisms, and implementing flow and congestion control. The server is a concurrent server which can handle multiple clients simultaneously. A client gives the server the name of a file. The server forks off a child which reads directly from the file and transfers the contents over to the client using UDP datagrams. The client prints out the file contents as they come in, in order, with nothing missing and with no duplication of content, directly on to stdout (via the receiver sliding window, of course, but with no other intermediate buffering). The file to be transferred can be of arbitrary length, but its contents are always straightforward ascii text. As an aside let me mention that assuming the file contents ascii is not as restrictive as it sounds. We can always pretend, for example, that binary files are base64 encoded (“ASCII armor”). A real file transfer protocol would, of course, have to worry about transferring files between heterogeneous platforms with different file structure conventions and semantics. The sender would first have to transform the file into a platform-independent, protocol-defined, format (using, say, ASN.1, or some such standard), and the receiver would have to transform the received file into its platform’s native file format. This kind of thing can be fairly time consuming, and is certainly very tedious, to implement, with little educational value - it is not part of this assignment. Arguments for the server You should provide the server with an input file server.in from which it reads the following information, in the order shown, one item per line : Well-known port number for server. Maximum sending sliding-window size (in datagram units). You will not be handing in your server.in file. We shall create our own when we come to test your code. So it is important that you stick strictly to the file name and content conventions specified above. The same applies to the client.in input file below. Arguments for the client The client is to be provided with an input file client.in from which it reads the following information, in the order shown, one item per line : IP address of server (not the hostname). Well-known port number of server. filename to be transferred. Receiving sliding-window size (in datagram units). Random generator seed value. Probability p of datagram loss. This should be a real number in the range [ 0.0 , 1.0 ] (value 0.0 means no loss occurs; value 1.0 means all datagrams all lost). The mean µ, in milliseconds, for an exponential distribution controlling the rate at which the client reads received datagram payloads from its receive buffer. Operation Server starts up and reads its arguments from file server.in. As we shall see, when a client communicates with the server, the server will want to know what IP address that client is using to identify the server (i.e. , the destination IP address in the incoming datagram). Normally, this can be done relatively straightforwardly using the IP_RECVDESTADDR socket option, and picking up the information using the ancillary data (‘control information’) capability of the recvmsg function. Unfortunately, Solaris 2.10 does not support the IP_RECVDESTADDR option (nor, incidentally, does it support the msg_flags option in msghdr - see p.390). This considerably complicates things. In the absence of IP_RECVDESTADDR, what the server has to do as part of its initialization phase is to bind each IP address it has (and, simultaneously, its well-known port number, which it has read in from server.in) to a separate UDP socket. The code in Section 22.6, which uses the get_ifi_info function, shows you how to do that. However, there are important differences between that code and the version you want to implement. The code of Section 22.6 binds the IP addresses and forks off a child for each address that is bound to. We do not want to do that. Instead you should have an array of socket descriptors. For each IP address, create a new socket and bind the address (and well-known port number) to the socket without forking off child processes. Creating child processes comes later, when clients arrive. The code of Section 22.6 also attempts to bind broadcast addresses. We do not want to do this. It binds a wildcard IP address, which we certainly do not want to do either. We should bind strictly only unicast addresses (including the loopback address). The get_ifi_info function (which the code in Section 22.6 uses) has to be modified so that it also gets the network masks for the IP addresses of the node, and adds these to the information stored in the linked list of ifi_info structures (see Figure 17.5, p.471) it produces. As you go binding each IP address to a distinct socket, it will be useful for later processing to build your own array of structures, where a structure element records the following information for each socket : sockfd IP address bound to the socket network mask for the IP address subnet address (obtained by doing a bit-wise and between the IP address and its network mask) Report, in a ReadMe file which you hand in with your code, on the modifications you had to introduce to ensure that only unicast addresses are bound, and on your implementation of the array of structures described above. You should print out on stdout, with an appropriate message and appropriately formatted in dotted decimal notation, the IP address, network mask, and subnet address for each socket in your array of structures (you do not need to print the sockfd). The server now uses select to monitor the sockets it has created for incoming datagrams. When it returns from select, it must use recvfrom or recvmsg to read the incoming datagram (see 6. below). When a client starts, it first reads its arguments from the file client.in. The client checks if the server host is ‘local’ to its (extended) Ethernet. If so, all its communication to the server is to occur as MSG_DONTROUTE (or SO_DONTROUTE socket option). It determines if the server host is ‘local’ as follows. The first thing the client should do is to use the modified get_ifi_info function to obtain all of its IP addresses and associated network masks. Print out on stdout, in dotted decimal notation and with an appropriate message, the IP addresses and network masks obtained. In the following, IPserver designates the IP address the client will use to identify the server, and IPclient designates the IP address the client will choose to identify itself. The client checks whether the server is on the same host. If so, it should use the loopback address 127.0.0.1 for the server (i.e. , IPserver = 127.0.0.1). IPclient should also be set to the loopback address. Otherwise it proceeds as follows: IPserver is set to the IP address for the server in the client.in file. Given IPserver and the (unicast) IP addresses and network masks for the client returned by get_ifi_info in the linked list of ifi_info structures, you should be able to figure out if the server node is ‘local’ or not. This will be discussed in class; but let me just remind you here that you should use ‘longest prefix matching’ where applicable. If there are multiple client addresses, and the server host is ‘local’, the client chooses an IP address for itself, IPclient, which matches up as ‘local’ according to your examination above. If the server host is not ‘local’, then IPclient can be chosen arbitrarily. Print out on stdout the results of your examination, as to whether the server host is ‘local’ or not, as well as the IPclient and IPserver addresses selected. Note that this manner of determining whether the server is local or not is somewhat clumsy and ‘over-engineered’, and, as such, should be viewed more in the nature of a pedagogical exercise. Ideally, we would like to look up the server IP address(es) in the routing table (see Section 18.3). This requires that a routing socket be created, for which we need superuser privilege. Alternatively, we might want to dump out the routing table, using the sysctl function for example (see Section 18.4), and examine it directly. Unfortunately, Solaris 2.10 does not support sysctl. Furthermore, note that there is a slight problem with the address 130.245.1.123/24 assigned to compserv3 (see rightmost column of file hosts, and note that this particular compserv3 address “overlaps” with the 130.245.1.x/28 addresses in that same column assigned to compserv1, compserv2 & comserv4). In particular, if the client is running on compserv3 and the server on any of the other three compservs, and if that server node is also being identified to the client by its /28 (rather than its /24) address, then the client will get a “false positive” when it tests as to whether the server node is local or not. In other words, the client will deem the server node to be local, whereas in fact it should not be considered local. Because of this, it is perhaps best simply not to use compserv3 to run the client (but it is o.k. to use it to run the server). Finally, using MSG_DONTROUTE where possible would seem to gain us efficiency, in as much as the kernel does not need to consult the routing table for every datagram sent. But, in fact, that is not so. Recall that one effect of connect with UDP sockets is that routing information is obtained by the kernel at the time the connect is issued. That information is cached and used for subsequent sends from the connected socket (see p.255). The client now creates a UDP socket and calls bind on IPclient, with 0 as the port number. This will cause the kernel to bind an ephemeral port to the socket. After the bind, use the getsockname function (Section 4.10) to obtain IPclient and the ephemeral port number that has been assigned to the socket, and print that information out on stdout, with an appropriate message and appropriately formatted. The client connects its socket to IPserver and the well-known port number of the server. After the connect, use the getpeername function (Section 4.10) to obtain IPserver and the well-known port number of the server, and print that information out on stdout, with an appropriate message and appropriately formatted. The client sends a datagram to the server giving the filename for the transfer. This send needs to be backed up by a timeout in case the datagram is lost. Note that the incoming datagram from the client will be delivered to the server at the socket to which the destination IP address that the datagram is carrying has been bound. Thus, the server can obtain that address (it is, of course, IPserver) and thereby achieve what IP_RECVDESTADDR would have given us had it been available. Furthermore, the server process can obtain the IP address (this will, of course, be IPclient) and ephemeral port number of the client through the recvfrom or recvmsg functions. The server forks off a child process to handle the client. The server parent process goes back to the select to listen for new clients. Hereafter, and unless otherwise stated, whenever we refer to the ‘server’, we mean the server child process handling the client’s file transfer, not the server parent process. Typically, the first thing the server child would be expected to do is to close all sockets it ‘inherits’ from its parent. However, this is not the case with us. The server child does indeed close the sockets it inherited, but not the socket on which the client request arrived. It leaves that socket open for now. Call this socket the ‘listening’ socket. The server (child) then checks if the client host is local to its (extended) Ethernet. If so, all its communication to the client is to occur as MSG_DONTROUTE (or SO_DONTROUTE socket option). If IPserver (obtained in 5. above) is the loopback address, then we are done. Otherwise, the server has to proceed with the following step. Use the array of structures you built in 1. above, together with the addresses IPserver and IPclient to determine if the client is ‘local’. Print out on stdout the results of your examination, as to whether the client host is ‘local’ or not. The server (child) creates a UDP socket to handle file transfer to the client. Call this socket the ‘connection’ socket. It binds the socket to IPserver, with port number 0 so that its kernel assigns an ephemeral port. After the bind, use the getsockname function (Section 4.10) to obtain IPserver and the ephemeral port number that has been assigned to the socket, and print that information out on stdout, with an appropriate message and appropriately formatted. The server then connects this ‘connection’ socket to the client’s IPclient and ephemeral port number. The server now sends the client a datagram, in which it passes it the ephemeral port number of its ‘connection’ socket as the data payload of the datagram. This datagram is sent using the ‘listening’ socket inherited from its parent, otherwise the client (whose socket is connected to the server’s ‘listening’ socket at the latter’s well-known port number) will reject it. This datagram must be backed up by the ARQ mechanism, and retransmitted in the event of loss. Note that if this datagram is indeed lost, the client might well time out and retransmit its original request message (the one carrying the file name). In this event, you must somehow ensure that the parent server does not mistake this retransmitted request for a new client coming in, and spawn off yet another child to handle it. How do you do that? It is potentially more involved than it might seem. I will be discussing this in class, as well as ‘race’ conditions that could potentially arise, depending on how you code the mechanisms I present. When the client receives the datagram carrying the ephemeral port number of the server’s ‘connection’ socket, it reconnects its socket to the server’s ‘connection’ socket, using IPserver and the ephemeral port number received in the datagram (see p.254). It now uses this reconnected socket to send the server an acknowledgment. Note that this implies that, in the event of the server timing out, it should retransmit two copies of its ‘ephemeral port number’ message, one on its ‘listening’ socket and the other on its ‘connection’ socket (why?). When the server receives the acknowledgment, it closes the ‘listening’ socket it inherited from its parent. The server can now commence the file transfer through its ‘connection’ socket. The net effect of all these binds and connects at server and client is that no ‘outsider’ UDP datagram (broadcast, multicast, unicast - fortuitously or maliciously) can now intrude on the communication between server and client. Starting with the first datagram sent out, the client behaves as follows. Whenever a datagram arrives, or an ACK is about to be sent out (or, indeed, the initial datagram to the server giving the filename for the transfer), the client uses some random number generator function random() (initialized by the client.in argument value seed) to decide with probability p (another client.in argument value) if the datagram or ACK should be discarded by way of simulating transmission loss across the network. (I will briefly discuss in class how you do this.) Adding reliability to UDP The mechanisms you are to implement are based on TCP Reno. These include : Reliable data transmission using ARQ sliding-windows, with Fast Retransmit. Flow control via receiver window advertisements. Congestion control that implements : SlowStart Congestion Avoidance (‘Additive-Increase/Multiplicative Decrease’ – AIMD) Fast Recovery (but without the window-inflation aspect of Fast Recovery) Only some, and by no means all, of the details for these are covered below. The rest will be presented in class, especially those concerning flow control and TCP Reno’s congestion control mechanisms in general : Slow Start, Congestion Avoidance, Fast Retransmit and Fast Recovery. Implement a timeout mechanism on the sender (server) side. This is available to you from Stevens, Section 22.5 . Note, however, that you will need to modify the basic driving mechanism of Figure 22.7 appropriately since the situation at the sender side is not a repetitive cycle of send-receive, but rather a straightforward progression of send-send-send-send- . . . . . . . . . . . Also, modify the RTT and RTO mechanisms of Section 22.5 as specified below. I will be discussing the details of these modifications and the reasons for them in class. Modify function rtt_stop (Fig. 22.13) so that it uses integer arithmetic rather than floating point. This will entail your also having to modify some of the variable and function parameter declarations throughout Section 22.5 from float to int, as appropriate. In the unprrt.h header file (Fig. 22.10) set : RTT_RXTMIN to 1000 msec. (1 sec. instead of the current value 3 sec.) RTT_RXTMAX to 3000 msec. (3 sec. instead of the current value 60 sec.) RTT_MAXNREXMT to 12 (instead of the current value 3) In function rtt_timeout (Fig. 22.14), after doubling the RTO in line 86, pass its value through the function rtt_minmax of Fig. 22.11 (somewhat along the lines of what is done in line 77 of rtt_stop, Fig. 22.13). Finally, note that with the modification to integer calculation of the smoothed RTT and its variation, and given the small RTT values you will experience on the cs / sbpub network, these calculations should probably now be done on a millisecond or even microsecond scale (rather than in seconds, as is the case with Stevens’ code). Otherwise, small measured RTTs could show up as 0 on a scale of seconds, yielding a negative result when we subtract the smoothed RTT from the measured RTT (line 72 of rtt_stop, Fig. 22.13). Report the details of your modifications to the code of Section 22.5 in the ReadMe file which you hand in with your code. We need to have a sender sliding window mechanism for the retransmission of lost datagrams; and a receiver sliding window in order to ensure correct sequencing of received file contents, and some measure of flow control. You should implement something based on TCP Reno’s mechanisms, with cumulative acknowledgments, receiver window advertisements, and a congestion control mechanism I will explain in detail in class. For a reference on TCP’s mechanisms generally, see W. Richard Stevens, TCP/IP Illustrated, Volume 1 , especially Sections 20.2 - 20.4 of Chapter 20 , and Sections 21.1 - 21.8 of Chapter 21 . Bear in mind that our sequence numbers should count datagrams, not bytes as in TCP. Remember that the sender and receiver window sizes have to be set according to the argument values in client.in and server.in, respectively. Whenever the sender window becomes full and so ‘locks’, the server should print out a message to that effect on stdout. Similarly, whenever the receiver window ‘locks’, the client should print out a message on stdout. Be aware of the potential for deadlock when the receiver window ‘locks’. This situation is handled by having the receiver process send a duplicate ACK which acts as a window update when its window opens again (see Figure 20.3 and the discussion about it in TCP/IP Illustrated). However, this is not enough, because ACKs are not backed up by a timeout mechanism in the event they are lost. So we will also need to implement a persist timer driving window probes in the sender process (see Sections 22.1 & 22.2 in Chapter 22 of TCP/IP Illustrated). Note that you do not have to worry about the Silly Window Syndrome discussed in Section 22.3 of TCP/IP Illustrated since the receiver process consumes ‘full sized’ 512-byte messages from the receiver buffer (see 3. below). Report on the details of the ARQ mechanism you implemented in the ReadMe file you hand in. Indeed, you should report on all the TCP mechanisms you implemented in the ReadMe file, both the ones discussed here, and the ones I will be discussing in class. Make your datagram payload a fixed 512 bytes, inclusive of the file transfer protocol header (which must, at the very least, carry: the sequence number of the datagram; ACKs; and advertised window notifications). The client reads the file contents in its receive buffer and prints them out on stdout using a separate thread. This thread sits in a repetitive loop till all the file contents have been printed out, doing the following. It samples from an exponential distribution with mean µ milliseconds (read from the client.in file), sleeps for that number of milliseconds; wakes up to read and print all in-order file contents available in the receive buffer at that point; samples again from the exponential distribution; sleeps; and so on. The formula -1 × µ × ln( random( ) ) , where ln is the natural logarithm, yields variates from an exponential distribution with mean µ, based on the uniformly-distributed variates over ( 0 , 1 ) returned by random(). Note that you will need to implement some sort of mutual exclusion/semaphore mechanism on the client side so that the thread that sleeps and wakes up to consume from the receive buffer is not updating the state variables of the buffer at the same time as the main thread reading from the socket and depositing into the buffer is doing the same. Furthermore, we need to ensure that the main thread does not effectively monopolize the semaphore (and thus lock out for prolonged periods of time) the sleeping thread when the latter wakes up. See the textbook, Section 26.7, ‘Mutexes: Mutual Exclusion’, pp.697-701. You might also find Section 26.8, ‘Condition Variables’, pp.701-705, useful. You will need to devise some way by which the sender can notify the receiver when it has sent the last datagram of the file transfer, without the receiver mistaking that EOF marker as part of the file contents. (Also, note that the last data segment could be a “short” segment of less than 512 bytes – your client needs to be able to handle this correctly somehow.) When the sender receives an ACK for the last datagram of the transfer, the (child) server terminates. The parent server has to take care of cleaning up zombie children. Note that if we want a clean closing, the client process cannot simply terminate when the receiver ACKs the last datagram. This ACK could be lost, which would leave the (child) server process ‘hanging’, timing out, and retransmitting the last datagram. TCP attempts to deal with this problem by means of the TIME_WAIT state. You should have your receiver process behave similarly, sticking around in something akin to a TIME_WAIT state in case in case it needs to retransmit the ACK. In the ReadMe file you hand in, report on how you dealt with the issues raised here: sender notifying receiver of the last datagram, clean closing, and so on. Output Some of the output required from your program has been described in the section Operation above. I expect you to provide further output – clear, well-structured, well-laid-out, concise but sufficient and helpful – in the client and server windows by means of which we can trace the correct evolution of your TCP’s behaviour in all its intricacies : information (e.g., sequence number) on datagrams and acks sent and dropped, window advertisements, datagram retransmissions (and why : dup acks or RTO); entering/exiting Slow Start and Congestion Avoidance, ssthresh and cwnd values; sender and receiver windows locking/unlocking; etc., etc. . . . . The onus is on you to convince us that the TCP mechanisms you implemented are working correctly. Too many students do not put sufficient thought, creative imagination, time or effort into this. It is not the TA’s nor my responsibility to sit staring at an essentially blank screen, trying to summon up our paranormal psychology skills to figure out if your TCP implementation is really working correctly in all its very intricate aspects, simply because the transferred file seems to be printing o.k. in the client window. Nor is it our responsibility to strain our eyes and our patience wading through a mountain of obscure, ill-structured, hyper-messy, debugging-style output because, for example, your effort-conserving concept of what is ‘suitable’ is to dump your debugging output on us, relevant, irrelevant, and everything in between.

What is JavaScript and what does it do? Before you start learning something new, it’s important to understand exactly what it is and what it does. This is especially useful when it comes to mastering a new programming language. In simple terms, JavaScript is a programming language used to make websites interactive. If you think about the basic makeup of a website, you have HTML, which describes and defines the basic content and structure of the website, then you have CSS, which tells the browser how this HTML content should be displayed—determining things like color and font. With just HTML and CSS, you have a website that looks good but doesn’t actually do much. JavaScript brings the website to life by adding functionality. JavaScript is responsible for elements that the user can interact with, such as drop-down menus, modal windows, and contact forms. It is also used to create things like animations, video players, and interactive maps. Nowadays, JavaScript is an all-purpose programming language—meaning it runs across the entire software stack. The most popular application of JavaScript is on the client side (aka frontend), but since Node.js came on the scene, many people run JavaScript on the server side (aka backend) as well. When used on the client side, JavaScript code is read, interpreted, and executed in the user’s web browser. When used on the server side, it is run on a remote computer. You can learn more about the difference between frontend and backend programming here. JavaScript isn’t only used to create websites. It can also be used to build browser-based games and, with the help of certain frameworks, mobile apps for different operating systems. The creation of new libraries and frameworks is also making it possible to build backend programs with JavaScript, such as web apps and server apps. Is it still worth learning JavaScript in 2021? The world of web development is constantly moving. With so many new tools popping up all the time, it can be extremely difficult to know where you should focus your efforts. As an aspiring developer, you’ll want to make sure that what you’re learning is still relevant in today’s industry. If you’re having doubts about JavaScript, it’s important to know that, since its creation in 1995, JavaScript is pretty much everywhere on the web—and that’s not likely to change any time soon. According to the 2020 StackOverflow developer survey, JavaScript is the most commonly used programming language for the eighth year in a row. It is currently used by 94.5% of all websites and, despite originally being designed as a client-side language, JavaScript has now made its way to the server-side of websites (thanks to Node.js), mobile devices (thanks to React Native and Ionic) and desktop (courtesy of Electron). As long as people are interacting with the web, you can assume that JavaScript is highly relevant—there’s no doubt that this is a language worth knowing! With that in mind, let’s look at some of the key benefits of becoming a JavaScript expert. Why learn JavaScript? The most obvious reason for learning JavaScript is if you have hopes of becoming a web developer. Even if you haven’t got your heart set on a tech career, being proficient in JavaScript will enable you to build websites from scratch—a pretty useful skill to have in today’s job market! If you do want to become a web developer, here are some of the main reasons why you should learn JavaScript: JavaScript experts are versatile JavaScript is an extremely versatile language. Once you’ve mastered it, the possibilities are endless: you can code on the client-side (frontend) using Angular and on the server-side (backend) using Node.js. You can also develop web, mobile, and desktop apps using React, React Native, and Electron, and you can even get involved in machine learning. If you want to become a frontend developer, JavaScript is a prerequisite. However, that’s not the only career path open to you as a JavaScript expert. Mastering this key programming language could see you go on to work in full-stack development, games development, information security software engineering, machine learning, and artificial intelligence—to name just a few! Ultimately, if you want any kind of development or engineering career, proficiency in JavaScript is a must. JavaScript experts are in-demand (and well-paid) JavaScript is the most popular programming language in the world, so it’s no wonder that JavaScript is one of the most sought-after skills in the web development industry today. According to the Devskiller IT Skills and Hiring Report 2020, 72% of companies are looking to hire JavaScript experts. Enter the search term “JavaScript” on job site Indeed and you’ll find over 40,000 jobs requiring this skill (in the US). Run the same search on LinkedIn and the results are in excess of 125,000. At the same time, the global demand for JavaScript seems to outweigh the expertise available on the market. According to this 2018 HackerRank report, 48% of employers worldwide need developers with JavaScript skills, while only 42% of student developers claim to be proficient in JavaScript. And, in their most recent report for 2020, HackerRank once again reports that JavaScript is the most popular language that hiring mangers look for in a web developer candidate. Not only are JavaScript experts in demand—they are also well-paid. In the United States, JavaScript developers earn an average yearly salary of $111,953 per year. We’ve covered this topic in more detail in our JavaScript salary guide, but as you can see, learning JavaScript can really boost your earning potential as a developer. JavaScript is beginner-friendly Compared to many other programming languages, JavaScript offers one of the more beginner-friendly entry points into the world of coding. The great thing about JavaScript is that it comes installed on every modern web browser—there’s no need to set up any kind of development environment, which means you can start coding with JavaScript right away! Another advantage of learning JavaScript as your first programming language is that you get instant feedback; with a minimal amount of JavaScript code, you’ll immediately see visible results. There’s also a huge JavaScript community on sites like Stack Overflow, so you’ll find plenty of support as you learn. Not only is JavaScript beginner-friendly; it will also set you up with some extremely valuable transferable skills. JavaScript supports object-oriented, functional, and imperative styles of programming—skills which can be transferred to any new language you might learn later on, such as Python, Java, or C++. JavaScript provides a crucial introduction to key principles and practices that you’ll take with you throughout your career as a developer. Should you learn plain JavaScript first or can you skip to frameworks and libraries? When deciding whether or not to learn JavaScript, what you’re really asking is whether or not you should learn “vanilla” JavaScript. Vanilla JavaScript just means plain JavaScript without any libraries or frameworks. Let’s explore what this means in more detail now. What is meant by vanilla JavaScript, libraries, and frameworks? If you research the term “vanilla JavaScript”, you might run into some confusion; however, all you need to know is that vanilla JavaScript is used to refer to native, standards-based, non-extended JavaScript. There is no difference between vanilla JavaScript and JavaScript—it’s just there to emphasize the usage of plain JavaScript without the use of libraries and frameworks. So what are libraries and frameworks? JavaScript libraries and frameworks both contain sets of prewritten, ready-to-use JavaScript code—but they’re not the same thing. You can think of a framework as your blueprint for building a website: it gives you a structure to work from, and contains ready-made components and tools that help you to build certain elements much quicker than if you were to code them from scratch. Some popular JavaScript frameworks include Angular, React, Vue, and Node.js. Frameworks also contain libraries. Libraries are smaller than frameworks, and tend to be used for more specific cases. A JavaScript library contains sets of JavaScript code which can be called upon to implement certain functions and features. Let’s imagine you want to code a particular element into your website. You could write, say, ten lines of JavaScript from scratch—or you could take the condensed, ready-made version from your chosen JavaScript library. Some examples of JavaScript libraries include jQuery, Lodash, and Underscore. The easiest way to understand how frameworks and libraries work together is to imagine you are building a house. The framework provides the foundation and the structure, while the library enables you to add in ready-made components (like furniture) rather than building your own from scratch. You can learn more about the relationship between languages and libraries in this post explaining the main differences between JavaScript and jQuery. For now, let’s go back to our original question: How important is it to learn vanilla JavaScript? Should you learn vanilla JavaScript first? When it comes to learning JavaScript, it can be tempting to skip ahead to those time-saving frameworks and libraries we just talked about—and many developers do. However, there are many compelling arguments for learning plain JavaScript first. While JavaScript frameworks may help you get the job done quicker, there’s only so far you can go if you don’t understand the core concepts behind these frameworks. Frontend developer Abhishek Nagekar describes how not learning vanilla JavaScript came back to bite him when he started learning the JavaScript frameworks Node and Express: “As I went to write more and more code in Node and Express, I began to get stuck at even the tiniest problems. Suddenly, I was surrounded with words like callbacks, closures, event loop and prototype. It felt like I got a reintroduction to JavaScript, but this time, it was not a toddler playing in its cradle, it was something of a mysterious monster, challenging me on every other step for not having taken it seriously.” The above Tweet references a long-running joke within the developer community, and although it dates way back to 2015, it’s still highly relevant today. If you want to become a developer who can innovate, not just execute, you need to understand the underlying principles of the web—not just the shortcuts. This means learning vanilla JavaScript before you move on to frameworks. In fact, understanding plain JavaScript will help you later on when it comes to deciding whether to use a framework for a certain project, and if so, which framework to use. Why Study JavaScript? JavaScript is one of the 3 languages all web developers must learn: 1. HTML to define the content of web pages 2. CSS to specify the layout of web pages 3. JavaScript to program the behavior of web pages Learning Speed In this tutorial, the learning speed is your choice. Everything is up to you. If you are struggling, take a break, or re-read the material. Always make sure you understand all the "Try-it-Yourself" examples. The only way to become a clever programmer is to: Practice. Practice. Practice. Code. Code. Code ! Commonly Asked Questions How do I get JavaScript? Where can I download JavaScript? Is JavaScript Free? You don't have to get or download JavaScript. JavaScript is already running in your browser on your computer, on your tablet, and on your smart-phone. JavaScript is free to use for everyone.

Go/Echo+</>Templ: User List App as an example of a project structured in layers, use of Templ Template language and frontend with HTMx technology

Example of how to structure a GraphQL-Application using Go and gqlgen

Examples of our talks about how to structure the Go code

Example Cloud Run Go app with lightweight structured logging using `slog`

Example todo application in Go showing project structure for an HTTP based API

The aim of this assignment is to have you do TCP socket client / server programming using I/O multiplexing, child processes and threads. It also aims at getting you to familiarize yourselves with the inetd superserver daemon, the ‘exec’ family of functions, various socket error scenarios, some socket options, and some basic domain name / IP address conversion functions. Apart from the material in Chapters 1 to 6 covered in class, you will also need to refer to the following : the exec family of functions (Section 4.7 of Chapter 4) using pipes for interprocess communication (IPC) in Unix error scenarios induced by process terminations & host crashes (Sections 5.11 to 5.16, Chapter 5) setsockopt function & SO_REUSEADDR socket option (Section 7.2 & pp.210-213, Chapter 7) gethostbyname & gethostbyaddr functions (Sections 11.3 & 11.4, Chapter 11) the basic structure of inetd (Section 13.5, Chapter 13) programming with threads (Sections 26.1 to 26.5, Chapter 26) Overview I shall present an overview of this assignment and discuss some of the specification details given below in class on Wednesday, September 17 & Monday, September 22. Client The client is evoked with a command line argument giving either the server IP address in dotted decimal notation, or the server domain name. The client has to be able to handle either mode and figure out which of the two is being passed to it. If it is given the IP address, it calls the gethostbyaddr function to get the domain name, which it then prints out to the user in the form of an appropriate message (e.g., ‘The server host is compserv1.cs.stonybrook.edu’). The function gethostbyname, on the other hand, returns the IP address that corresponds to a given domain name. The client then enters an infinite loop in which it queries the user which service is being requested. There are two options : echo and time (note that time is a slightly modified version of the daytime service – see below). The client then forks off a child. After the child is forked off, the parent process enters a second loop in which it continually reads and prints out status messages received from the child via a half-duplex pipe (see below). The parent exits the second loop when the child closes the pipe (how does the parent detect this?), and/or the SIGCHLD signal is generated when the child terminates. The parent then repeats the outer loop, querying the user again for the (next) service s/he desires. This cycle continues till the user responds to a query with quit rather than echo or time. The child process is the one which handles the actual service for the user. It execs (see Section 4.7, Chapter 4) an xterm to generate a separate window through which all interactions with server and user take place. For example, the following exec function call evokes an xterm, and gets the xterm to execute echocli, located in the current directory, passing the string 127.0.0.1 (assumed to be the IP address of the server) as the command line argument argv[1] to echocli (click on the url for further details) : execlp("xterm", "xterm", "-e", "./echocli", "127.0.0.1", (char *) 0) xterm executes one of two client programs (echocli or timecli, say) depending on the service requested. A client program establishes a TCP connection to the server at the ‘well-known port’ for the service (in reality, this port will, of course, be some ephemeral port of your choosing, the value of which is known to both server and client code). All interaction with the user, on the one hand, and with the server, on the other, takes place through the child’s xterm window, not the parent’s window. On the other hand, the child will use a half-duplex pipe to relay status information to the parent which the parent prints out in its window (see below).To terminate the echo client, the user can type in ^D (CTRL D, the EOF character). To terminate the time client, the only option is for the user to type in ^C (CTRL C). (This can also be used as an alternative means of terminating the echo client.) Note that using ^C in the context of the time service will give the server process the impression that the client process has ‘crashed’. It is your responsibility to ensure that the server process handles this correctly and closes cleanly. I shall address this further when discussing the server process. It is also part of your responsibility in this assignment to ensure that the client code is robust with respect to the server process crashing (see Sections 5.12 & 5.13, Chapter 5). Amongst other implications, this means that it would probably be a good idea for you to implement your echo client code along the lines of either : Figure 6.9, p.168 (or even Figure 6.13, p.174) which uses I/O multiplexing with the select function; or of Figure 26.2, p.680, which uses threads; rather than along the lines of Figure 5.5, p.125. When the child terminates, either normally or abnormally, its xterm window disappears instantaneously. Consequently, any status information that the child might want to communicate to the user should not be printed out on the child’s xterm window, since the user will not have time to see the final such message before the window disappears. Instead, as the parent forks off the child at the beginning, a half-duplex pipe should be established from child to parent. The child uses the pipe to send status reports to the parent, which the parent prints out in its window. I leave it up to you to decide what status information exactly should be relayed to the parent but, at a minimum, the parent should certainly be notified, in as precise terms as possible, of any abnormal termination conditions of the service provided by the child. In general, you should try to make your code as robust as possible with respect to handling errors, including confused behaviour by the user (e.g., passing an invalid command line argument; responding to a query incorrectly; trying to interact with the service through the parent process window, not the child process xterm; etc.). Amongst other things, you have to worry about EINTR errors occurring during slow system calls (such as the parent reading from the pipe, or, possibly, printing to stdout, for example) due to a SIGCHLD signal. What about other kinds of errors? Which ones can occur? How should you handle them? Server The server has to be able to handle multiple clients using threads (specifically, detached threads), not child processes (see Sections 26.1 to 26.4, Chapter 26). Furthermore, it has to be able to handle multiple types of service; in our case, two : echo and time. echo is just the standard echo service we have seen in class. time is a slightly modified version of the daytime service (see Figure 1.9, p.14) : instead of sending the client the ‘daytime’ just once and closing, the service sits in an infinite loop, sending the ‘daytime’, sleeping for 5 seconds, and repeating, ad infinitum. The server is loosely based on the way the inetd daemon works : see Figure 13.7, p.374. However, note that the differences between inetd and our server are probably more significant than the similarities: inetd forks off children, whereas our server uses threads; inetd child processes issue exec commands, which our server threads do not; etc. So you should treat Figure 13.7 (and Section 13.5, Chapter 13, generally) as a source of ideas, not as a set of specifications which you must slavishly adhere to and copy. Note, by the way, that there are some similarities between our client and inetd (primarily, forking off children which issue execs), which could be a useful source of ideas. The server creates a listening socket for each type of service that it handles, bound to the ‘well-known port’ for that service. It then uses select to await clients (Chapter 6; or, if you prefer, poll; note that pselect is not supported in Solaris 2.10). The socket on which a client connects identifies the service the client is seeking. The server accepts the connection and creates a thread which provides the service. The thread detaches itself. Meanwhile, the main thread goes back to the select to await further clients. A major concern when using threads is to make sure that operations are thread safe (see p.685 and on into Section 26.5). In this respect, Stevens’ readline function (in Stevens’ file unpv13e/lib/readline.c, see Figure 3.18, pp.91-92) poses a particular problem. On p.686, the authors give three options for dealing with this. The third option is too inefficient and should be discarded. You can implement the second option if you wish. Easiest of all would be the first option, since it involves using a thread-safe version of readline (see Figures 26.11 & 26.12) provided in file unpv13e/threads/readline.c. Whatever you do, remember that Stevens’ library, libunp.a, contains the non-thread-safe version of Figure 3.18, and that is the version that will be link-loaded to your code unless you undertake explicit steps to ensure this does not happen (libunp.a also contains the ‘wrapper’ function Readline, whose code is also in file unpv13e/lib/readline.c). Remaking your copy of libunp.a with the ‘correct’ version of readline is not a viable option because when you hand in your code, it will be compiled and link-loaded with respect to the version of libunp.a in the course account, ~cse533/Stevens/unpv13e_solaris2.10 (I do not intend to change that version since it risks creating confusion later on in the course). Also, you will probably want to use the original version of readline in the client code anyway. I am providing you with a sample Makefile which picks up the thread-safe version of readline from directory ~cse533/Stevens/unpv13e_solaris2.10/threads and uses it when making the executable for the server, but leaves the other executables it makes to link-load the non-thread-safe version from libunp.a. Again, it is part of your responsibility to make sure that your server code is as robust as possible with respect to errors, and that the server threads terminate cleanly under all circumstances. Recall, first of all, that the client user will often use ^C (CTRL C) in the xterm to terminate the service. This will appear to the server thread as if the client process has crashed. You need to think about the error conditions that will be induced (see Sections 5.11 to 5.13, Chapter 5), and how the echo and time server code is to detect and handle these conditions. For example, the time server will almost certainly experience an EPIPE error (see Section 5.13). How should the associated SIGPIPE signal be handled? Be aware that when we return out of the Stevens’ writen function with -1 (indicating an error) and check errno, errno is sometimes equal to 0, not EPIPE (value 32). This can happen under Solaris 2.10, but I am not sure under precisely what conditions nor why. Nor am I sure if it also happens under other Unix versions, or if it also happens when using write rather than writen. The point is, you cannot depend on errno to find out what has happened to the write or writen functions. My suggestion, therefore, is that the time server should use the select function. On the one hand, select’s timeout mechanism can be used to make the server sleep for the 5 seconds. On the other hand, select should also monitor the connection socket read event because, when the client xterm is ^C’ed, a FIN will be sent to the server TCP, which will prime the socket for reading; a read on the socket will then return with value 0 (see Figure 14.3, p. 385 as an example). But what about errors other than EPIPE? Which ones can occur? How should you handle them? Recall, as well, that if a thread terminates without explicitly closing the connection socket it has been using, the connection socket will remain existent until the server process itself dies (why?). Since the server process is supposed, in principle, to run for ever, you risk ending up with an ever increasing number of unused, ‘orphaned’ sockets unless you are careful. Whenever a server thread detects the termination of its client, it should print out a message giving appropriate details: e.g., “Client termination: EPIPE error detected”, “Client termination: socket read returned with value 0”, “Client termination: socket read returned with value -1, errno = . . .”, and so on. When debugging your server code, you will probably find that restarting the server very shortly after it was last running will give you trouble when it comes to bind to its ‘well-known ports’. This is because, when the server side initiates connection termination (which is what will happen if the server process crashes; or if you kill it first, before killing the client) TCP keeps the connections open in the TIME_WAIT state for 2MSLs (Sections 2.6 & 2.7, Chapter 2). This could very quickly become a major irritant. I suggest you explore the possibility of using the SO_REUSEADDR socket option (pp.210-213, Chapter 7; note that the SO_REUSEPORT socket option is not supported in Solaris 2.10), which should help keep the stress level down. You will need to use the setsockopt function (Section 7.2) to enable this option. Figure 8.24, p.263, shows an instance of server code that sets the SO_REUSEADDR socket option. Finally, you should be aware of the sort of problem, described in Section 16.6, pp.461-463, that might occur when (blocking) listening sockets are monitored using select. Such sockets should be made nonblocking, which requires use of the fcntl function after socket creates the socket, but before listen turns the socket into a listening socket.

Image Classifier Going forward, AI algorithms will be incorporated into more and more everyday applications. For example, you might want to include an image classifier in a smartphone app. To do this, you'd use a deep learning model trained on hundreds of thousands of images as part of the overall application architecture. A large part of software development in the future will be using these types of models as common parts of applications. In this project, you'll train an image classifier to recognize different species of flowers. You can imagine using something like this in a phone app that tells you the name of the flower your camera is looking at. In practice, you'd train this classifier, then export it for use in your application. We'll be using this dataset of 102 flower categories. When you've completed this project, you'll have an application that can be trained on any set of labelled images. Here your network will be learning about flowers and end up as a command line application. But, what you do with your new skills depends on your imagination and effort in building a dataset. This is the final Project of the Udacity AI with Python Nanodegree Prerequisites The Code is written in Python 3.6.5 . If you don't have Python installed you can find it here. If you are using a lower version of Python you can upgrade using the pip package, ensuring you have the latest version of pip. To install pip run in the command Line python -m ensurepip -- default-pip to upgrade it python -m pip install -- upgrade pip setuptools wheel to upgrade Python pip install python -- upgrade Additional Packages that are required are: Numpy, Pandas, MatplotLib, Pytorch, PIL and json. You can donwload them using pip pip install numpy pandas matplotlib pil or conda conda install numpy pandas matplotlib pil In order to intall Pytorch head over to the Pytorch site select your specs and follow the instructions given. Viewing the Jyputer Notebook In order to better view and work on the jupyter Notebook I encourage you to use nbviewer . You can simply copy and paste the link to this website and you will be able to edit it without any problem. Alternatively you can clone the repository using git clone https://github.com/fotisk07/Image-Classifier/ then in the command Line type, after you have downloaded jupyter notebook type jupyter notebook locate the notebook and run it. Command Line Application Train a new network on a data set with train.py Basic Usage : python train.py data_directory Prints out current epoch, training loss, validation loss, and validation accuracy as the netowrk trains Options: Set direcotry to save checkpoints: python train.py data_dor --save_dir save_directory Choose arcitecture (alexnet, densenet121 or vgg16 available): pytnon train.py data_dir --arch "vgg16" Set hyperparameters: python train.py data_dir --learning_rate 0.001 --hidden_layer1 120 --epochs 20 Use GPU for training: python train.py data_dir --gpu gpu Predict flower name from an image with predict.py along with the probability of that name. That is you'll pass in a single image /path/to/image and return the flower name and class probability Basic usage: python predict.py /path/to/image checkpoint Options: Return top K most likely classes: python predict.py input checkpoint ---top_k 3 Use a mapping of categories to real names: python predict.py input checkpoint --category_names cat_To_name.json Use GPU for inference: python predict.py input checkpoint --gpu Json file In order for the network to print out the name of the flower a .json file is required. If you aren't familiar with json you can find information here. By using a .json file the data can be sorted into folders with numbers and those numbers will correspond to specific names specified in the .json file. Data and the json file The data used specifically for this assignemnt are a flower database are not provided in the repository as it's larger than what github allows. Nevertheless, feel free to create your own databases and train the model on them to use with your own projects. The structure of your data should be the following: The data need to comprised of 3 folders, test, train and validate. Generally the proportions should be 70% training 10% validate and 20% test. Inside the train, test and validate folders there should be folders bearing a specific number which corresponds to a specific category, clarified in the json file. For example if we have the image a.jpj and it is a rose it could be in a path like this /test/5/a.jpg and json file would be like this {...5:"rose",...}. Make sure to include a lot of photos of your catagories (more than 10) with different angles and different lighting conditions in order for the network to generalize better. GPU As the network makes use of a sophisticated deep convolutional neural network the training process is impossible to be done by a common laptop. In order to train your models to your local machine you have three options Cuda -- If you have an NVIDIA GPU then you can install CUDA from here. With Cuda you will be able to train your model however the process will still be time consuming Cloud Services -- There are many paid cloud services that let you train your models like AWS or Google Cloud Coogle Colab -- Google Colab gives you free access to a tesla K80 GPU for 12 hours at a time. Once 12 hours have ellapsed you can just reload and continue! The only limitation is that you have to upload the data to Google Drive and if the dataset is massive you may run out of space. However, once a model is trained then a normal CPU can be used for the predict.py file and you will have an answer within some seconds. Hyperparameters As you can see you have a wide selection of hyperparameters available and you can get even more by making small modifications to the code. Thus it may seem overly complicated to choose the right ones especially if the training needs at least 15 minutes to be completed. So here are some hints: By increasing the number of epochs the accuracy of the network on the training set gets better and better however be careful because if you pick a large number of epochs the network won't generalize well, that is to say it will have high accuracy on the training image and low accuracy on the test images. Eg: training for 12 epochs training accuracy: 85% Test accuracy: 82%. Training for 30 epochs training accuracy 95% test accuracy 50%. A big learning rate guarantees that the network will converge fast to a small error but it will constantly overshot A small learning rate guarantees that the network will reach greater accuracies but the learning process will take longer Densenet121 works best for images but the training process takes significantly longer than alexnet or vgg16 *My settings were lr=0.001, dropoup=0.5, epochs= 15 and my test accuracy was 86% with densenet121 as my feature extraction model. Pre-Trained Network The checkpoint.pth file contains the information of a network trained to recognise 102 different species of flowers. I has been trained with specific hyperparameters thus if you don't set them right the network will fail. In order to have a prediction for an image located in the path /path/to/image using my pretrained model you can simply type python predict.py /path/to/image checkpoint.pth Contributing Please read CONTRIBUTING.md for the process for submitting pull requests. Authors Shanmukha Mudigonda - Initial work Udacity - Final Project of the AI with Python Nanodegree

Please Read Me First. This is a set of java file of my final version of electronic artifacts. This is a game to map my experience in Disney World, in Orlando during this spring break. However, because of my limited skills in computer science, I really have no idea how to simplify the process to run the game. Sorry for the inconvenience. In order to run the game, you may need to install JAVA. I hope the following links will help you.     http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html#javasejdk
    http://www.cc.gatech.edu/~simpkins/teaching/gatech/cs1331/guides/install-java.html My main file is called Disney. You can call Disney in console to start the game. However, I failed to putting all the things inside Disney file. Therefore, you may also need to call AdventureLand, MainStreet, and FrontierLand to start other three games. I hope this will help you. Sorry again for the inconvenience. 1. the structure of my project My project only focused on my trip in Magic Kingdom, one part of Disney world in Orlando. It is a game which guides players to choose from six sub-games, which match six sections of the park, Main Street U.S.A, Tomorrowland, Adventureland, Frontierland, Fantasyland and Liberty Square. I chose one of the rides I took in each section which, from my perspective, shows what I found interesting in Disney world. I changed what I experienced in the park into a small computer game. I want to share my experience with others while they play my games. In the following part of self reflection, I explain the background, rules and other things about each game. For convenience of matching them, I use different color to mark different parts. I hope it will help readers a little bit when they are lost in my disordered reflections. 1. the hall of presidents - Liberty Square 2. Festivall parade - Fantasyland (I explain this one in the part of technology skill limitations) 3. Big Thunder Mountain Railroad - Frontierland 4.talking with Woody- Adventureland 5. Stitch Store - Tomorrowland 6. lunch time - Main Street USA 3. my reflection of the trip in Disney World from dream to reality When I exited Disney resort, I found a sign along the street welcomed people back to real world. Actually, when I was in Orlando, I couldn't believe as an adult, people can mess up fantasy world in the theme parks and the real world. Nevertheless, I felt I was still in fantasy world, when I dreamed twice that I fought for the key to open the door of future. As is known to all, while sleeping, people always dream about what people thinks in the daytime. Therefore, my dream shows that my mind still stayed in the world with Mickey and Donald. I believe that it is experiencing fantasy world which is the source of the greatest happiness people get from theme park. On the one hand, everybody has pressure in real life especially for adults. They can get out of pressure for a day trip in theme park. They can experience different lives here with cartoon characters. On the other hand, sometimes, it is a really hard task to fulfill some dreams, such as being a princess. However, in Disney world, you can dress up the same as Snow White, waiting for your prince; you can go to space by rocket; you can also travel all over the world in one day and enjoy the food of each country. These are all the magic of theme parks. Therefore, in my game, I learnt the way which Disney design their rides to focus on the background story of the game instead of the game itself. For example, there is a ride called Big Thunder Mountain Railroad, which streaks through a haunted gold-mining town aboard a rollicking runaway mine train. The views around the ride were like a gold mining town. There were tools for gold-mining around the railroad and the railroad looked like very old. In order to show riders that it was a haunted gold-mining town, the train always took a sudden turn or speed up quickly to scare people. I decided to name one of my game, which was inspired by this ride, the same name, Big Thunder Mountain Railroad. Instead of sitting inside the mine train to travel around the haunted town, mine was for users to use keyboard to control the train to travel around the gridding railroad. I place traps inside several parts of gridding to "scare" players, who cannot know where traps are until they get into them. If I know how to use animation, I will show scary pictures when players drive their train to the traps. Unlike the ride in Disney, my players can no longer travel once they encounter a trap because their train may have some problems to keep moving. Also, the main goal in the game is to find the gold. However, as we know, finding gold is really hard. Therefore, players must go to find Aladdin's Wonderful lamp where also places inside the gridding while players cannot see its exact place until they happen to drive inside the part where lamp is. Aladdin's Wonderful lamp will show players the map of the gold and when people get to the gold mine, they win. However, there is another limitation of the game. Haunted town is so dangerous during the night. Therefore, players only have 12 hours to finish the task. Train can drive one square in 20 min. Therefore, train can only move 36 times or they will also be caught by traps. In this game, I want to show audiences I have a background story like rides in Disney World. Players need to find the gold in a haunted gold-mining town. Also, in order to show the relationship with Disney, I use Aladdin's Wonderful Lamp as the guide for the players, which is a well known characters in Disney cartoon. I created another game, called talking with Woody to show the magic power of Disney characters. There are a lot of chances to meet Disney characters in Disney world. On the one hand, travelers, especially small kids, are really excited to meet the characters they watched on TV. I think some kids may believe they take pictures with real Mickey Mouse. On the hand, staffs in Disney who wear the costumes are really tired. It was hot in Orlando last week, but all costumes were very heavy. I was moved by the staffs inside Mickey. They also need to mimic the actions of characters and also need to show kindness and warmness to children. It seems like a really hard job. Therefore, I decide to show this part of Disney in my project as well. I decided to use Woody, a toy all the toys look up to. He is smart, kind and brave like a cowboy should be. He is more than a top, he is friend to everyone enjoying the movie Toy. In order to create an interactive game, I planned to ask players to guide Woody. Players need to call Woody before their instructions. For instance, if players say (actually players are typing) "Woody, please sit down", Woody will sit down (actually, there will be another line on the screen showing the same as players import). However, if players are rude and just say "sit down" without calling Woody, Woody won't act (actually there is just nothing showing up on the screen). great facilities to provide convenience to everyone The facilities to satisfy needs for special groups of people, like small kids or disabled people, are well developed. In the past in China, it seemed impossible for parents to take infants and small kids to travel. The road is not flat or wide enough for strollers or wheelchairs. However, in Disney world, everything seemed like well prepared for everyone to use. There are strollers rentals, and electric conveyance vehicles rentals, which are available to rent throughout Disney world. There are baby care center for mothers to feed, change and nurse little ones. There are locker rentals for storing personal items. There are also hearing disability services which have sign language interpretation to help disabled people to enjoy fantasy world. There are still a lot other convenient services in Disney world. I think the purpose of these services show the pursue of equality among everyone in the world. On the one hand, I am really touched by the availability of these services here. It seems Disney try its best to service everyone who have desire to experience fantasy land. On the other hand, in this way, Disney can attract more travelers in order to make more money in some ways. Also, in Disney, it seems like a tradition that there are stores at the exit of the famous rides. Somebody may think it is just a strategy to make people shopping a lot. However, I think it also provides some convenience that travelers can buy souvenirs where is memorable. For example, when I finished my trip in Escape Stitch, I entered a store with a lot of kinds of Stitch, like Stitch pillow, Stitch key chain and so on. I really want to buy something in order to remind me the wonderful feelings. Therefore, I showed my opinion inside my game as well. I wrote one part is for shopping. The items are different kinds of Stitch. My codes can act as a robot to help customers to shop in the store. There are a lot of restaurants in Disney. Maps of Disney are full of restaurants' name. The greatest things about the food are in Epcot, I experienced different counties in one day. I felt like I was in fast travel in different parts of the world and tasted their special food and snacks while I was on the way. I remembered I was still eating Japanese food when I was in "Mexico". It was a great experience. However, there were always a long waiting lines for the all restaurants. People needed to reserve a table a day before their trip and even they had the reservation, they still needed to wait for a long time. I think Disney may need some good ways to fix the problems of waiting for a long time. I have no idea of changing the situation of restaurants, but I think if there are robots to customers to order in fast food restaurant, it may help a lot. Thus, I have another code to customers to order in Plaza Restaurant. If this kind of robots can work in the real life, people can order by themselves and there will be more staffs available to prepare food. theme park uses interesting ways to teach knowledge of boring topics Theme part is also a great source of learning knowledge, especially for kids. They use Disney characters, interesting shows, or even games to teach useful things. The ways change the boring knowledge to interesting things, which always attract children's attention. The most amazing one was an interactive game in Epcot's Innoventions, called "where's the fire?", which teaches adults and children basic fire safety in a fun and entertaining way. About every five minutes, the players waiting in line are divided into two groups and move into the home's entry. Here, a host will explain the object of the game and lay out the rules. The scenario is this: you are on a mission to discover a number of fire hazards commonly found around the house. To do this, you move from room to room, looking for potential risks. To help in the task, each player is given a special "safely light" to help uncover lurking dangers. The rooms are large projection screens. When a hazard is discovered, all persons in the room must shine their safety light on the same spot. when they do, the hazard is rendered harmless and points are assigned. After playing in the game to find the hazardous things in the house, I learned a lot of safety tips. It is much easier to remember the tips I learned during the game than those I learned on textbook or internet. I believe kids will enjoy the games and learn from them as well. I also tried to show this reflection in my project. Thus, I planned to make a game, called the hall of presidents, which test people's knowledge of presidents in USA. However, I failed to achieve the goal of making it an entertaining game instead of a quiz. My game was still like a quiz. However, because it is the only code which can work well inside my big game. I decide to still hold the game for my projects in order to what my original ideas are. 4. technology skill limitations I feel terribly sorry for my limited skills in CS. It is my first time to learn JAVA this semester. I just begin to learn the core concepts of JAVA this month. When I choose to use java code for this project, I know I will face plentiful limitations and problems. Here I want to express my gratitude to Dr. Johnson, who encouraged me not to give up my ideas. To be honest, I have no idea of how to change a java code into a real game with animations. I know the background story of the game is more important for English course and pictures are the best way to show the background, but I have no idea to show all these things by JAVA coding. Therefore, I choose to use videos for my presentation. In this way, I can show my animation inside the videos while the code clue of my game is still composed by JAVA coding. Also, video gives me a lot of freedom when choose my contents for presentation. I can explain a lot details of my project clearly through videos. For example, I found the festival parade in the magic kingdom was great and I wanted to share the experience in my project by showing the pictures or videos. However, because of the technology limitations, I can only show the videos in my presentations. Also, I mistakenly deleted my videos which I shot on my trip Orlando, I can only share others' parade show...... Also, I want to apologize for the incompleteness of my game. I only dedicated to writing codes for Magic Kingdom, a part of my trip during spring break. Writing codes is a really time consuming task for me. In general, I need to spend more than eight hours to finish one project for my CS assignment this semester. While for this project, the final artifacts are composed of several parts of codes and in the end I need to write the father code in order to take care of my code family for spring break. Due to my limitation in writing codes, I can only finish one part of Disney world. However, I think my code shows all my reflections and perspectives during my trip, even though it looks like it only shows one part of my trip. The terrible mistake I made is that I found out the most of my codes I wrote had significant errors on Tuesday. I went to CS TA office for help, while the errors were still impossible to fix in order to achieve the goal I planned to get. Consequently, my game have to be separated into several parts. Instead of a big game having others as sub-games inside the big one, my final artifacts are composed by several small games. I need to start them one by one. It may cause some inconvenience for players to map their trip in Disney world.

An example of a graphql-go based structured project.

Example project structure go web servers written in Go

# Cmder [](https://gitter.im/cmderdev/cmder?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [](https://ci.appveyor.com/project/MartiUK/cmder) Cmder is a **software package** created out of pure frustration over absence of usable console emulator on Windows. It is based on [ConEmu](https://conemu.github.io/) with *major* config overhaul, comes with a Monokai color scheme, amazing [clink](https://chrisant996.github.io/clink/) (further enhanced by [clink-completions](https://github.com/vladimir-kotikov/clink-completions)) and a custom prompt layout.  ## Why use it The main advantage of Cmder is portability. It is designed to be totally self-contained with no external dependencies, which makes it great for **USB Sticks** or **cloud storage**. So you can carry your console, aliases and binaries (like wget, curl and git) with you anywhere. The Cmder's user interface is also designed to be more eye pleasing, and you can compare the main differences between Cmder and ConEmu [here](https://conemu.github.io/en/cmder.html). ## Installation ### Single User Portable Config 1. Download the [latest release](https://github.com/cmderdev/cmder/releases/) 2. Extract the archive. *Note: This path should not be `C:\Program Files` or anywhere else that would require Administrator access for modifying configuration files* 3. (optional) Place your own executable files into the `%cmder_root%\bin` folder to be injected into your PATH. 4. Run `Cmder.exe` ### Shared Cmder install with Non-Portable Individual User Config 1. Download the [latest release](https://github.com/cmderdev/cmder/releases/) 2. Extract the archive to a shared location. 3. (optional) Place your own executable files and custom app folders into the `%cmder_root%\bin`. See: [bin/README.md](./bin/Readme.md) - This folder to be injected into your PATH by default. - See `/max_depth [1-5]` in 'Command Line Arguments for `init.bat`' table to add subdirectories recursively. 4. (optional) Place your own custom app folders into the `%cmder_root%\opt`. See: [opt/README.md](./opt/Readme.md) - This folder will NOT be injected into your PATH so you have total control of what gets added. 5. Run `Cmder.exe` with `/C` command line argument. Example: `cmder.exe /C %userprofile%\cmder_config` * This will create the following directory structure if it is missing. ``` c:\users\[CH JaDi Rajput]\cmder_config ├───bin ├───config │ └───profile.d └───opt ``` - (optional) Place your own executable files and custom app folders into `%userprofile%\cmder_config\bin`. - This folder to be injected into your PATH by default. - See `/max_depth [1-5]` in 'Command Line Arguments for `init.bat`' table to add subdirectories recursively. - (optional) Place your own custom app folders into the `%user_profile%\cmder_config\opt`. - This folder will NOT be injected into your PATH so you have total control of what gets added. * Both the shared install and the individual user config locations can contain a full set of init and profile.d scripts enabling shared config with user overrides. See below. ## Cmder.exe Command Line Arguments | Argument | Description | | ------------------- | ----------------------------------------------------------------------- | | `/C [user_root_path]` | Individual user Cmder root folder. Example: `%userprofile%\cmder_config` | | `/M` | Use `conemu-%computername%.xml` for ConEmu settings storage instead of `user_conemu.xml` | | `/REGISTER [ALL, USER]` | Register a Windows Shell Menu shortcut. | | `/UNREGISTER [ALL, USER]` | Un-register a Windows Shell Menu shortcut. | | `/SINGLE` | Start Cmder in single mode. | | `/START [start_path]` | Folder path to start in. | | `/TASK [task_name]` | Task to start after launch. | | `/X [ConEmu extras pars]` | Forwards parameters to ConEmu | ## Context Menu Integration So you've experimented with Cmder a little and want to give it a shot in a more permanent home; ### Shortcut to open Cmder in a chosen folder 1. Open a terminal as an Administrator 2. Navigate to the directory you have placed Cmder 3. Execute `.\cmder.exe /REGISTER ALL` _If you get a message "Access Denied" ensure you are executing the command in an **Administrator** prompt._ In a file explorer window right click in or on a directory to see "Cmder Here" in the context menu. ## Keyboard shortcuts ### Tab manipulation * <kbd>Ctrl</kbd> + <kbd>T</kbd> : New tab dialog (maybe you want to open cmd as admin?) * <kbd>Ctrl</kbd> + <kbd>W</kbd> : Close tab * <kbd>Ctrl</kbd> + <kbd>D</kbd> : Close tab (if pressed on empty command) * <kbd>Shift</kbd> + <kbd>Alt</kbd> + <kbd>#Number</kbd> : Fast new tab: <kbd>1</kbd> - CMD, <kbd>2</kbd> - PowerShell * <kbd>Ctrl</kbd> + <kbd>Tab</kbd> : Switch to next tab * <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>Tab</kbd> : Switch to previous tab * <kbd>Ctrl</kbd> + <kbd>#Number</kbd> : Switch to tab #Number * <kbd>Alt</kbd> + <kbd>Enter</kbd>: Fullscreen ### Shell * <kbd>Ctrl</kbd> + <kbd>Alt</kbd> + <kbd>U</kbd> : Traverse up in directory structure (lovely feature!) * <kbd>End</kbd>, <kbd>Home</kbd>, <kbd>Ctrl</kbd> : Traversing text with as usual on Windows * <kbd>Ctrl</kbd> + <kbd>R</kbd> : History search * <kbd>Shift</kbd> + Mouse : Select and copy text from buffer _(Some shortcuts are not yet documented, though they exist - please document them here)_ ## Features ### Access to multiple shells in one window using tabs You can open multiple tabs each containing one of the following shells: | Task | Shell | Description | | ---- | ----- | ----------- | | Cmder | `cmd.exe` | Windows `cmd.exe` shell enhanced with Git, Git aware prompt, Clink (GNU Readline), and Aliases. | | Cmder as Admin | `cmd.exe` | Administrative Windows `cmd.exe` Cmder shell. | | PowerShell | `powershell.exe` | Windows PowerShell enhanced with Git and Git aware prompt . | | PowerShell as Admin | `powershell.exe` | Administrative Windows `powershell.exe` Cmder shell. | | Bash | `bash.exe` | Unix/Linux like bash shell running on Windows. | | Bash as Admin | `bash.exe` | Administrative Unix/Linux like bash shell running on Windows. | | Mintty | `bash.exe` | Unix/Linux like bash shell running on Windows. See below for Mintty configuration differences | | Mintty as Admin | `bash.exe` | Administrative Unix/Linux like bash shell running on Windows. See below for Mintty configuration differences | Cmder, PowerShell, and Bash tabs all run on top of the Windows Console API and work as you might expect in Cmder with access to use ConEmu's color schemes, key bindings and other settings defined in the ConEmu Settings dialog. ⚠ *NOTE:* Only the full edition of Cmder comes with a pre-installed bash, using a vendored [git-for-windows](https://gitforwindows.org/) installation. The pre-configured Bash tabs may not work on Cmder mini edition without additional configuration. You may however, choose to use an external installation of bash, such as Microsoft's [Subsystem for Linux](https://docs.microsoft.com/en-us/windows/wsl/install-win10) (called WSL) or the [Cygwin](https://cygwin.com/) project which provides POSIX support on windows. ⚠ *NOTE:* Mintty tabs use a program called 'mintty' as the terminal emulator that is not based on the Windows Console API, rather it's rendered graphically by ConEmu. Mintty differs from the other tabs in that it supports xterm/xterm-256color TERM types, and does not work with ConEmu settings like color schemes and key bindings. As such, some differences in functionality are to be expected, such as Cmder not being able to apply a system-wide configuration to it. As a result mintty specific config is done via the `[%USERPROFILE%|$HOME]/.minttyrc` file. You may read more about Mintty and its config file [here](https://github.com/mintty/mintty). An example of setting Cmder portable terminal colors for mintty: From a bash/mintty shell: ``` cd $CMDER_ROOT/vendor git clone https://github.com/karlin/mintty-colors-solarized.git cd mintty-colors-solarized/ echo source \$CMDER_ROOT/vendor/mintty-colors-solarized/mintty-solarized-dark.sh>>$CMDER_ROOT/config/user_profile.sh ``` You may find some Monokai color schemes for mintty to match Cmder [here](https://github.com/oumu/mintty-color-schemes/blob/master/base16-monokai-mod.minttyrc). ### Changing Cmder Default `cmd.exe` Prompt Config File The default Cmder shell `cmd::Cmder` prompt is customized using `Clink` and is configured by editing a config file that exists in one of two locations: - Single User Portable Config `%CMDER_ROOT%\config\cmder_prompt_config.lua` - Shared Cmder install with Non-Portable Individual User Config `%CMDER_USER_CONFIG%\cmder_prompt_config.lua` If your Cmder setup does not have this file create it from `%CMDER_ROOT%\vendor\cmder_prompt_config.lua.default` Customizations include: - Colors. - Single/Multi-line. - Full path/Folder only. - `[user]@[host]` to the beginning of the prompt. - `~` for home directory. - `λ` symbol Documentation is in the file for each setting. ### Changing Cmder Default `cmd.exe` Shell Startup Behaviour Using Task Arguments 1. Press <kbd>Win</kbd> + <kbd>Alt</kbd> + <kbd>T</kbd> 1. Click either: * `1. {cmd::Cmder as Admin}` * `2. {cmd::Cmder}` 1. Add command line arguments where specified below: *Note: Pay attention to the quotes!* ``` cmd /s /k ""%ConEmuDir%\..\init.bat" [ADD ARGS HERE]" ``` ##### Command Line Arguments for `init.bat` | Argument | Description | Default | | ----------------------------- | ---------------------------------------------------------------------------------------------- | ------------------------------------- | | `/c [user cmder root]` | Enables user bin and config folders for 'Cmder as admin' sessions due to non-shared environment. | not set | | `/d` | Enables debug output. | not set | | `/f` | Enables Cmder Fast Init Mode. This disables some features, see pull request [#1492](https://github.com/cmderdev/cmder/pull/1942) for more details. | not set | | `/t` | Enables Cmder Timed Init Mode. This displays the time taken run init scripts | not set | | `/git_install_root [file path]` | User specified Git installation root path. | `%CMDER_ROOT%\vendor\Git-for-Windows` | | `/home [home folder]` | User specified folder path to set `%HOME%` environment variable. | `%userprofile%` | | `/max_depth [1-5]` | Define max recurse depth when adding to the path for `%cmder_root%\bin` and `%cmder_user_bin%` | 1 | | `/nix_tools [0-2]` | Define how `*nix` tools are added to the path. Prefer Windows Tools: 1, Prefer *nix Tools: 2, No `/usr/bin` in `%PATH%`: 0 | 1 | | `/svn_ssh [path to ssh.exe]` | Define `%SVN_SSH%` so we can use git svn with ssh svn repositories. | `%GIT_INSTALL_ROOT%\bin\ssh.exe` | | `/user_aliases [file path]` | File path pointing to user aliases. | `%CMDER_ROOT%\config\user_aliases.cmd` | | `/v` | Enables verbose output. | not set | | (custom arguments) | User defined arguments processed by `cexec`. Type `cexec /?` for more usage. | not set | ### Cmder Shell User Config Single user portable configuration is possible using the cmder specific shell config files. Edit the below files to add your own configuration: | Shell | Cmder Portable User Config | | ------------- | ----------------------------------------- | | Cmder | `%CMDER_ROOT%\config\user_profile.cmd` | | PowerShell | `$ENV:CMDER_ROOT\config\user_profile.ps1` | | Bash/Mintty | `$CMDER_ROOT/config/user_profile.sh` | Note: Bash and Mintty sessions will also source the `$HOME/.bashrc` file if it exists after it sources `$CMDER_ROOT/config/user_profile.sh`. You can write `*.cmd|*.bat`, `*.ps1`, and `*.sh` scripts and just drop them in the `%CMDER_ROOT%\config\profile.d` folder to add startup config to Cmder. | Shell | Cmder `Profile.d` Scripts | | ------------- | -------------------------------------------------- | | Cmder | `%CMDER_ROOT%\config\profile.d\*.bat and *.cmd` | | PowerShell | `$ENV:CMDER_ROOT\config\profile.d\*.ps1` | | Bash/Mintty | `$CMDER_ROOT/config/profile.d/*.sh` | #### Git Status Opt-Out To disable Cmder prompt git status globally add the following to `~/.gitconfig` or locally for a single repo `[repo]/.git/config` and start a new session. *Note: This configuration is not portable* ``` [cmder] status = false # Opt out of Git status for 'ALL' Cmder supported shells. cmdstatus = false # Opt out of Git status for 'Cmd.exe' shells. psstatus = false # Opt out of Git status for 'Powershell.exe and 'Pwsh.exe' shells. shstatus = false # Opt out of Git status for 'bash.exe' shells. ``` ### Aliases #### Cmder(`Cmd.exe`) Aliases You can define simple aliases for `cmd.exe` sessions with a command like `alias name=command`. Cmd.exe aliases support optional parameters through the `$1-9` or the `$*` special characters so the alias `vi=vim.exe $*` typed as `vi [filename]` will open `[filename]` in `vim.exe`. Cmd.exe aliases can also be more complex. See: [DOSKEY.EXE documentation](https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/doskey) for additional details on complex aliases/macros for `cmd.exe` Aliases defined using the `alias.bat` command will automatically be saved in the `%CMDER_ROOT%\config\user_aliases.cmd` file To make an alias and/or any other profile settings permanent add it to one of the following: Note: These are loaded in this order by `$CMDER_ROOT/vendor/init.bat`. Anything stored in `%CMDER_ROOT%` will be a portable setting and will follow cmder to another machine. * `%CMDER_ROOT%\config\profile.d\*.cmd` and `\*.bat` * `%CMDER_ROOT%\config\user_aliases.cmd` * `%CMDER_ROOT%\config\user_profile.cmd` #### Bash.exe|Mintty.exe Aliases Bash shells support simple and complex aliases with optional parameters natively so they work a little different. Typing `alias name=command` will create an alias only for the current running session. To make an alias and/or any other profile settings permanent add it to one of the following: Note: These are loaded in this order by `$CMDER_ROOT/vendor/git-for-windows/etc/profile.d/cmder.sh`. Anything stored in `$CMDER_ROOT` will be a portable setting and will follow cmder to another machine. * `$CMDER_ROOT/config/profile.d/*.sh` * `$CMDER_ROOT/config/user_profile.sh` * `$HOME/.bashrc` If you add bash aliases to `$CMDER_ROOT/config/user_profile.sh` they will be portable and follow your Cmder folder if you copy it to another machine. `$HOME/.bashrc` defined aliases are not portable. #### PowerShell.exe Aliases PowerShell has native simple alias support, for example `[new-alias | set-alias] alias command`, so complex aliases with optional parameters are not supported in PowerShell sessions. Type `get-help [new-alias|set-alias] -full` for help on PowerShell aliases. To make an alias and/or any other profile settings permanent add it to one of the following: Note: These are loaded in this order by `$ENV:CMDER_ROOT\vendor\user_profile.ps1`. Anything stored in `$ENV:CMDER_ROOT` will be a portable setting and will follow cmder to another machine. * `$ENV:CMDER_ROOT\config\profile.d\*.ps1` * `$ENV:CMDER_ROOT\config\user_profile.ps1` ### SSH Agent To start the vendored SSH agent simply call `start-ssh-agent`, which is in the `vendor/git-for-windows/cmd` folder. If you want to run SSH agent on startup, include the line `@call "%GIT_INSTALL_ROOT%/cmd/start-ssh-agent.cmd"` in `%CMDER_ROOT%/config/user_profile.cmd` (usually just uncomment it). ### Vendored Git Cmder is by default shipped with a vendored Git installation. On each instance of launching Cmder, an attempt is made to locate any other user provided Git binaries. Upon finding a `git.exe` binary, Cmder further compares its version against the vendored one _by executing_ it. The vendored `git.exe` binary is _only_ used when it is more recent than the user-installed one. You may use your favorite version of Git by including its path in the `%PATH%` environment variable. Moreover, the **Mini** edition of Cmder (found on the [downloads page](https://github.com/cmderdev/cmder/releases)) excludes any vendored Git binaries. ### Using external Cygwin/Babun, MSys2, WSL, or Git for Windows SDK with Cmder. You may run bash (the default shell used on Linux, macOS and GNU/Hurd) externally on Cmder, using the following instructions: 1. Setup a new task by pressing <kbd>Win</kbd> +<kbd>Alt</kbd> + <kbd>T</kbd>. 1. Click the `+` button to add a task. 1. Name the new task in the top text box. 1. Provide task parameters, this is optional. 1. Add `cmd /c "[path_to_external_env]\bin\bash --login -i" -new_console` to the `Commands` text box. **Recommended Optional Steps:** Copy the `vendor/cmder_exinit` file to the Cygwin/Babun, MSys2, or Git for Windows SDK environments `/etc/profile.d/` folder to use portable settings in the `$CMDER_ROOT/config` folder. Note: MinGW could work if the init scripts include `profile.d` but this has not been tested. The destination file extension depends on the shell you use in that environment. For example: * bash - Copy to `/etc/profile.d/cmder_exinit.sh` * zsh - Copy to `/etc/profile.d/cmder_exinit.zsh` Uncomment and edit the below line in the script to use Cmder config even when launched from outside Cmder. ``` # CMDER_ROOT=${USERPROFILE}/cmder # This is not required if launched from Cmder. ``` ### Customizing user sessions using `init.bat` custom arguments. You can pass custom arguments to `init.bat` and use `cexec.cmd` in your `user_profile.cmd` to evaluate these arguments then execute commands based on a particular flag being detected or not. `init.bat` creates two shortcuts for using `cexec.cmd` in your profile scripts. #### `%ccall%` - Evaluates flags, runs commands if found, and returns to the calling script and continues. ``` ccall=call C:\Users\user\cmderdev\vendor\bin\cexec.cmd ``` Example: `%ccall% /startnotepad start notepad.exe` #### `%cexec%` - Evaluates flags, runs commands if found, and does not return to the calling script. ``` cexec=C:\Users\user\cmderdev\vendor\bin\cexec.cmd ``` Example: `%cexec% /startnotepad start notepad.exe` It is useful when you have multiple tasks to execute `cmder` and need it to initialize the session differently depending on the task chosen. To conditionally start `notepad.exe` when you start a specific `cmder` task: * Press <kbd>win</kbd>+<kbd>alt</kbd>+<kbd>t</kbd> * Click `+` to add a new task. * Add the below to the `Commands` block: ```batch cmd.exe /k ""%ConEmuDir%\..\init.bat" /startnotepad" ``` * Add the below to your `%cmder_root%\config\user_profile.cmd` ```batch %ccall% "/startNotepad" "start" "notepad.exe"` ``` To see detailed usage of `cexec`, type `cexec /?` in cmder. ### Integrating Cmder with [Hyper](https://github.com/zeit/hyper), [Microsoft VS Code](https://code.visualstudio.com/), and your favorite IDEs Cmder by default comes with a vendored ConEmu installation as the underlying terminal emulator, as stated [here](https://conemu.github.io/en/cmder.html). However, Cmder can in fact run in a variety of other terminal emulators, and even integrated IDEs. Assuming you have the latest version of Cmder, follow the following instructions to get Cmder working with your own terminal emulator. For instructions on how to integrate Cmder with your IDE, please read our [Wiki section](https://github.com/cmderdev/cmder/wiki#cmder-integration). ## Upgrading The process of upgrading Cmder depends on the version/build you are currently running. If you have a `[cmder_root]/config/user[-|_]conemu.xml`, you are running a newer version of Cmder, follow the below process: 1. Exit all Cmder sessions and relaunch `[cmder_root]/cmder.exe`, this backs up your existing `[cmder_root]/vendor/conemu-maximus5/conemu.xml` to `[cmder_root]/config/user[-|_]conemu.xml`. * The `[cmder_root]/config/user[-|_]conemu.xml` contains any custom settings you have made using the 'Setup Tasks' settings dialog. 2. Exit all Cmder sessions and backup any files you have manually edited under `[cmder_root]/vendor`. * Editing files under `[cmder_root]/vendor` is not recommended since you will need to re-apply these changes after any upgrade. All user customizations should go in `[cmder_root]/config` folder. 3. Delete the `[cmder_root]/vendor` folder. 4. Extract the new `cmder.zip` or `cmder_mini.zip` into `[cmder_root]/` overwriting all files when prompted. If you do not have a `[cmder_root]/config/user[-|_]conemu.xml`, you are running an older version of cmder, follow the below process: 1. Exit all Cmder sessions and backup `[cmder_root]/vendor/conemu-maximus5/conemu.xml` to `[cmder_root]/config/user[-|_]conemu.xml`. 2. Backup any files you have manually edited under `[cmder_root]/vendor`. * Editing files under `[cmder_root]/vendor` is not recommended since you will need to re-apply these changes after any upgrade. All user customizations should go in `[cmder_root]/config` folder. 3. Delete the `[cmder_root]/vendor` folder. 4. Extract the new `cmder.zip` or `cmder_mini.zip` into `[cmder_root]/` overwriting all files when prompted. ## Current development builds You can download builds of the current development branch by going to AppVeyor via the following link: [](https://ci.appveyor.com/project/MartiUK/cmder/branch/master/artifacts) ## License All software included is bundled with own license The MIT License (MIT) Copyright (c) 2016 Samuel Vasko Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Overview For this assignment you will be developing and implementing : An On-Demand shortest-hop Routing (ODR) protocol for networks of fixed but arbitrary and unknown connectivity, using PF_PACKET sockets. The implementation is based on (a simplified version of) the AODV algorithm. Time client and server applications that send requests and replies to each other across the network using ODR. An API you will implement using Unix domain datagram sockets enables applications to communicate with the ODR mechanism running locally at their nodes. I shall be discussing the assignment in class on Wednesday, October 29, and Monday, November 3. The following should prove useful reference material for the assignment : Sections 15.1, 15.2, 15.4 & 15.6, Chapter 15, on Unix domain datagram sockets. PF_PACKET(7) from the Linux manual pages. You might find these notes made by a past CSE 533 student useful. Also, the following link http://www.pdbuchan.com/rawsock/rawsock.html contains useful code samples that use PF_PACKET sockets (as well as other code samples that use raw IP sockets which you do not need for this assignment, though you will be using these types of sockets for Assignment 4). Charles E. Perkins & Elizabeth M. Royer. “Ad-hoc On-Demand Distance Vector Routing.” Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications, New Orleans, Louisiana, February 1999, pp. 90 - 100. The VMware environment minix.cs.stonybrook.edu is a Linux box running VMware. A cluster of ten Linux virtual machines, called vm1 through vm10, on which you can gain access as root and run your code have been created on minix. See VMware Environment Hosts for further details. VMware instructions takes you to a page that explains how to use the system. The ten virtual machines have been configured into a small virtual intranet of Ethernet LANs whose topology is (in principle) unknown to you. There is a course account cse533 on node minix, with home directory /users/cse533. In there, you will find a subdirectory Stevens/unpv13e , exactly as you are used to having on the cs system. You should develop your source code and makefiles for handing in accordingly. You will be handing in your source code on the minix node. Note that you do not need to link against the socket library (-lsocket) in Linux. The same is true for -lnsl and -lresolv. For example, take a look at how the LIBS variable is defined for Solaris, in /home/courses/cse533/Stevens/unpv13e_solaris2.10/Make.defines (on compserv1, say) : LIBS = ../libunp.a -lresolv -lsocket -lnsl -lpthread But if you take a look at Make.defines on minix (/users/cse533/Stevens/unpv13e/Make.defines) you will find only: LIBS = ../libunp.a -lpthread The nodes vm1 , . . . . . , vm10 are all multihomed : each has two (or more) interfaces. The interface ‘eth0 ’ should be completely ignored and is not to be used for this assignment (because it shows all ten nodes as if belonging to the same single Ethernet 192.168.1.0/24, rather than to an intranet composed of several Ethernets). Note that vm1 , . . . . . , vm10 are virtual machines, not real ones. One implication of this is that you will not be able to find out what their (virtual) IP addresses are by using nslookup and such. To find out these IP addresses, you need to look at the file /etc/hosts on minix. More to the point, invoking gethostbyname for a given vm will return to you only the (primary) IP address associated with the interface eth0 of that vm (which is the interface you will not be using). It will not return to you any other IP address for the node. Similarly, gethostbyaddr will return the vm node name only if you give it the (primary) IP address associated with the interface eth0 for the node. It will return nothing if you give it any other IP address for the node, even though the address is perfectly valid. Because of this, and because it will ease your task to be able to use gethostbyname and gethostbyaddr in a straightforward way, we shall adopt the (primary) IP addresses associated with interfaces eth0 as the ‘canonical’ IP addresses for the nodes (more on this below). Time client and server A time server runs on each of the ten vm machines. The client code should also be available on each vm so that it can be evoked at any of them. Normally, time clients/servers exchange request/reply messages using the TCP/UDP socket API that, effectively, enables them to receive service (indirectly, via the transport layer) from the local IP mechanism running at their nodes. You are to implement an API using Unix domain sockets to access the local ODR service directly (somewhat similar, in effect, to the way that raw sockets permit an application to access IP directly). Use Unix domain SOCK_DGRAM, rather than SOCK_STREAM, sockets (see Figures 15.5 & 15.6, pp. 418 - 419). API You need to implement a msg_send function that will be called by clients/servers to send requests/replies. The parameters of the function consist of : int giving the socket descriptor for write char* giving the ‘canonical’ IP address for the destination node, in presentation format int giving the destination ‘port’ number char* giving message to be sent int flag if set, force a route rediscovery to the destination node even if a non-‘stale’ route already exists (see below) msg_send will format these parameters into a single char sequence which is written to the Unix domain socket that a client/server process creates. The sequence will be read by the local ODR from a Unix domain socket that the ODR process creates for itself. Recall that the ‘canonical’ IP address for a vm node is the (primary) IP address associated with the eth0 interface for the node. It is what will be returned to you by a call to gethostbyname. Similarly, we need a msg_recv function which will do a (blocking) read on the application domain socket and return with : int giving socket descriptor for read char* giving message received char* giving ‘canonical’ IP address for the source node of message, in presentation format int* giving source ‘port’ number This information is written as a single char sequence by the ODR process to the domain socket that it creates for itself. It is read by msg_recv from the domain socket the client/server process creates, decomposed into the three components above, and returned to the caller of msg_recv. Also see the section below entitled ODR and the API. Client When a client is evoked at a node, it creates a domain datagram socket. The client should bind its socket to a ‘temporary’ (i.e., not ‘well-known’) sun_path name obtained from a call to tmpnam() (cf. line 10, Figure 15.6, p. 419) so that multiple clients may run at the same node. Note that tmpnam() is actually highly deprecated. You should use the mkstemp() function instead - look up the online man pages on minix (‘man mkstemp’) for details. As you run client code again and again during the development stage, the temporary files created by the calls to tmpnam / mkstemp start to proliferate since these files are not automatically removed when the client code terminates. You need to explicitly remove the file created by the client evocation by issuing a call to unlink() or to remove() in your client code just before the client code exits. See the online man pages on minix (‘man unlink’, ‘man remove’) for details. The client then enters an infinite loop repeating the steps below. The client prompts the user to choose one of vm1 , . . . . . , vm10 as a server node. Client msg_sends a 1 or 2 byte message to server and prints out on stdout the message client at node vm i1 sending request to server at vm i2 (In general, throughout this assignment, “trace” messages such as the one above should give the vm names and not IP addresses of the nodes.) Client then blocks in msg_recv awaiting response. This attempt to read from the domain socket should be backed up by a timeout in case no response ever comes. I leave it up to you whether you ‘wrap’ the call to msg_recv in a timeout, or you implement the timeout inside msg_recv itself. When the client receives a response it prints out on stdout the message client at node vm i1 : received from vm i2 <timestamp> If, on the other hand, the client times out, it should print out the message client at node vm i1 : timeout on response from vm i2 The client then retransmits the message out, setting the flag parameter in msg_send to force a route rediscovery, and prints out an appropriate message on stdout. This is done only once, when a timeout for a given message to the server occurs for the first time. Client repeats steps 1. - 3. Server The server creates a domain datagram socket. The server socket is assumed to have a (node-local) ‘well-known’ sun_path name which it binds to. This ‘well-known’ sun_path name is designated by a (network-wide) ‘well-known’ ‘port’ value. The time client uses this ‘port’ value to communicate with the server. The server enters an infinite sequence of calls to msg_recv followed by msg_send, awaiting client requests and responding to them. When it responds to a client request, it prints out on stdout the message server at node vm i1 responding to request from vm i2 ODR The ODR process runs on each of the ten vm machines. It is evoked with a single command line argument which gives a “staleness” time parameter, in seconds. It uses get_hw_addrs (available to you on minix in ~cse533/Asgn3_code) to obtain the index, and associated (unicast) IP and Ethernet addresses for each of the node’s interfaces, except for the eth0 and lo (loopback) interfaces, which should be ignored. In the subdirectory ~cse533/Asgn3_code (/users/cse533/Asgn3_code) on minix I am providing you with two functions, get_hw_addrs and prhwaddrs. These are analogous to the get_ifi_info_plus and prifinfo_plus of Assignment 2. Like get_ifi_info_plus, get_hw_addrs uses ioctl. get_hw_addrs gets the (primary) IP address, alias IP addresses (if any), HW address, and interface name and index value for each of the node's interfaces (including the loopback interface lo). prhwaddrs prints that information out. You should modify and use these functions as needed. Note that if an interface has no HW address associated with it (this is, typically, the case for the loopback interface lo for example), then ioctl returns get_hw_addrs a HW address which is the equivalent of 00:00:00:00:00:00 . get_hw_addrs stores this in the appropriate field of its data structures as it would with any HW address returned by ioctl, but when prhwaddrs comes across such an address, it prints a blank line instead of its usual ‘HWaddr = xx:xx:xx:xx:xx:xx’. The ODR process creates one or more PF_PACKET sockets. You will need to try out PF_PACKET sockets for yourselves and familiarize yourselves with how they behave. If, when you read from the socket and provide a sockaddr_ll structure, the kernel returns to you the index of the interface on which the incoming frame was received, then one socket will be enough. Otherwise, somewhat in the manner of Assignment 2, you shall have to create a PF_PACKET socket for every interface of interest (which are all the interfaces of the node, excluding interfaces lo and eth0 ), and bind a socket to each interface. Furthermore, if the kernel also returns to you the source Ethernet address of the frame in the sockaddr_ll structure, then you can make do with SOCK_DGRAM type PF_PACKET sockets; otherwise you shall have to use SOCK_RAW type sockets (although I would prefer you to use SOCK_RAW type sockets anyway, even if it turns out you can make do with SOCK_DGRAM type). The socket(s) should have a protocol value (no larger than 0xffff so that it fits in two bytes; this value is given as a network-byte-order parameter in the call(s) to function socket) that identifies your ODR protocol. The <linux/if_ether.h> include file (i.e., the file /usr/include/linux/if_ether.h) contains protocol values defined for the standard protocols typically found on an Ethernet LAN, as well as other values such as ETH_P_ALL. You should set protocol to a value of your choice which is not a <linux/if_ether.h> value, but which is, hopefully, unique to yourself. Remember that you will all be running your code using the same root account on the vm1 , . . . . . , vm10 nodes. So if two of you happen to choose the same protocol value and happen to be running on the same vm node at the same time, your applications will receive each other’s frames. For that reason, try to choose a protocol value for the socket(s) that is likely to be unique to yourself (something based on your Stony Brook student ID number, for example). This value effectively becomes the protocol value for your implementation of ODR, as opposed to some other cse 533 student's implementation. Because your value of protocol is to be carried in the frame type field of the Ethernet frame header, the value chosen should be not less than 1536 (0x600) so that it is not misinterpreted as the length of an Ethernet 802.3 frame. Note from the man pages for packet(7) that frames are passed to and from the socket without any processing in the frame content by the device driver on the other side of the socket, except for calculating and tagging on the 4-byte CRC trailer for outgoing frames, and stripping that trailer before delivering incoming frames to the socket. Nevertheless, if you write a frame that is less than 60 bytes, the necessary padding is automatically added by the device driver so that the frame that is actually transmitted out is the minimum Ethernet size of 64 bytes. When reading from the socket, however, any such padding that was introduced into a short frame at the sending node to bring it up to the minimum frame size is not stripped off - it is included in what you receive from the socket (thus, the minimum number of bytes you receive should never be less than 60). Also, you will have to build the frame header for outgoing frames yourselves (assuming you use SOCK_RAW type sockets). Bear in mind that the field values in that header have to be in network order. The ODR process also creates a domain datagram socket for communication with application processes at the node, and binds the socket to a ‘well known’ sun_path name for the ODR service. Because it is dealing with fixed topologies, ODR is, by and large, considerably simpler than AODV. In particular, discovered routes are relatively stable and there is no need for all the paraphernalia that goes with the possibility of routes changing (such as maintenance of active nodes in the routing tables and timeout mechanisms; timeouts on reverse links; lifetime field in the RREP messages; etc.) Nor will we be implementing source_sequence_#s (in the RREQ messages), and dest_sequence_# (in RREQ and RREP messages). In reality, we should (though we will not, for the sake of simplicity, be doing so) implement some sort of sequence number mechanism, or some alternative mechanism such as split-horizon for example, if we are to avoid possible scenarios of routing loops in a “count to infinity” context (I shall explain this point in class). However, we want ODR to discover shortest-hop paths, and we want it to do so in a reasonably efficient manner. This necessitates having one or two aspects of its operations work in a different, possibly slightly more complicated, way than AODV does. ODR has several basic responsibilities : Build and maintain a routing table. For each destination in the table, the routing table structure should include, at a minimum, the next-hop node (in the form of the Ethernet address for that node) and outgoing interface index, the number of hops to the destination, and a timestamp of when the the routing table entry was made or last “reconfirmed” / updated. Note that a destination node in the table is to be identified only by its ‘canonical’ IP address, and not by any other IP addresses the node has. Generate a RREQ in response to a time client calling msg_send for a destination for which ODR has no route (or for which a route exists, but msg_send has the flag parameter set or the route has gone ‘stale’ – see below), and ‘flood’ the RREQ out on all the node’s interfaces (except for the interface it came in on and, of course, the interfaces eth0 and lo). Flooding is done using an Ethernet broadcast destination address (0xff:ff:ff:ff:ff:ff) in the outgoing frame header. Note that a copy of the broadcast packet is supposed to / might be looped back to the node that sends it (see p. 535 in the Stevens textbook). ODR will have to take care not to treat these copies as new incoming RREQs. Also note that ODR at the client node increments the broadcast_id every time it issues a new RREQ for any destination node. When a RREQ is received, ODR has to generate a RREP if it is at the destination node, or if it is at an intermediate node that happens to have a route (which is not ‘stale’ – see below) to the destination. Otherwise, it must propagate the RREQ by flooding it out on all the node’s interfaces (except the interface the RREQ arrived on). Note that as it processes received RREQs, ODR should enter the ‘reverse’ route back to the source node into its routing table, or update an existing entry back to the source node if the RREQ received shows a shorter-hop route, or a route with the same number of hops but going through a different neighbour. The timestamp associated with the table entry should be updated whenever an existing route is either “reconfirmed” or updated. Obviously, if the node is going to generate a RREP, updating an existing entry back to the source node with a more efficient route, or a same-hops route using a different neighbour, should be done before the RREP is generated. Unlike AODV, when an intermediate node receives a RREQ for which it generates a RREP, it should nevertheless continue to flood the RREQ it received if the RREQ pertains to a source node whose existence it has heretofore been unaware of, or the RREQ gives it a more efficient route than it knew of back to the source node (the reason for continuing to flood the RREQ is so that other nodes in the intranet also become aware of the existence of the source node or of the potentially more optimal reverse route to it, and update their tables accordingly). However, since an RREP for this RREQ is being sent by our node, we do not want other nodes who receive the RREQ propagated by our node, and who might be in a position to do so, to also send RREPs. So we need to introduce a field in the RREQ message, not present in the AODV specifications, which acts like a “RREP already sent” field. Our node sets this field before further propagating the RREQ and nodes receiving an RREQ with this field set do not send RREPs in response, even if they are in a position to do so. ODR may, of course, receive multiple, distinct instances of the same RREQ (the combination of source_addr and broadcast_id uniquely identifies the RREQ). Such RREQs should not be flooded out unless they have a lower hop count than instances of that RREQ that had previously been received. By the same token, if ODR is in a position to send out a RREP, and has already done so for this, now repeating, RREQ , it should not send out another RREP unless the RREQ shows a more efficient, previously unknown, reverse route back to the source node. In other words, ODR should not generate essentially duplicative RREPs, nor generate RREPs to instances of RREQs that reflect reverse routes to the source that are not more efficient than what we already have. Relay RREPs received back to the source node (this is done using the ‘reverse’ route entered into the routing table when the corresponding RREQ was processed). At the same time, a ‘forward’ path to the destination is entered into the routing table. ODR could receive multiple, distinct RREPs for the same RREQ. The ‘forward’ route entered in the routing table should be updated to reflect the shortest-hop route to the destination, and RREPs reflecting suboptimal routes should not be relayed back to the source. In general, maintaining a route and its associated timestamp in the table in response to RREPs received is done in the same manner described above for RREQs. Forward time client/server messages along the next hop. (The following is important – you will lose points if you do not implement it.) Note that such application payload messages (especially if they are the initial request from the client to the server, rather than the server response back to the client) can be like “free” RREPs, enabling nodes along the path from source (client) to destination (server) node to build a reverse path back to the client node whose existence they were heretofore unaware of (or, possibly, to update an existing route with a more optimal one). Before it forwards an application payload message along the next hop, ODR at an intermediate node (and also at the final destination node) should use the message to update its routing table in this way. Thus, calls to msg_send by time servers should never cause ODR at the server node to initiate RREQs, since the receipt of a time client request implies that a route back to the client node should now exist in the routing table. The only exception to this is if the server node has a staleness parameter of zero (see below). A routing table entry has associated with it a timestamp that gives the time the entry was made into the table. When a client at a node calls msg_send, and if an entry for the destination node already exists in the routing table, ODR first checks that the routing information is not ‘stale’. A stale routing table entry is one that is older than the value defined by the staleness parameter given as a command line argument to the ODR process when it is executed. ODR deletes stale entries (as well as non-stale entries when the flag parameter in msg_send is set) and initiates a route rediscovery by issuing a RREQ for the destination node. This will force periodic updating of the routing tables to take care of failed nodes along the current path, Ethernet addresses that might have changed, and so on. Similarly, as RREQs propagate through the intranet, existing stale table entries at intermediate nodes are deleted and new route discoveries propagated. As noted above when discussing the processing of RREQs and RREPs, the associated timestamp for an existing table entry is updated in response to having the route either “reconfirmed” or updated (this applies to both reverse routes, by virtue of RREQs received, and to forward routes, by virtue of RREPs). Finally, note that a staleness parameter of 0 essentially indicates that the discovered route will be used only once, when first discovered, and then discarded. Effectively, an ODR with staleness parameter 0 maintains no real routing table at all ; instead, it forces route discoveries at every step of its operation. As a practical matter, ODR should be run with staleness parameter values that are considerably larger than the longest RTT on the intranet, otherwise performance will degrade considerably (and collapse entirely as the parameter values approach 0). Nevertheless, for robustness, we need to implement a mechanism by which an intermediate node that receives a RREP or application payload message for forwarding and finds that its relevant routing table entry has since gone stale, can intiate a RREQ to rediscover the route it needs. RREQ, RREP, and time client/server request/response messages will all have to be carried as encapsulated ODR protocol messages that form the data payload of Ethernet frames. So we need to design the structure of ODR protocol messages. The format should contain a type field (0 for RREQ, 1 for RREP, 2 for application payload ). The remaining fields in an ODR message will depend on what type it is. The fields needed for (our simplified versions of AODV’s) RREQ and RREP should be fairly clear to you, but keep in mind that you need to introduce two extra fields: The “RREP already sent” bit or field in RREQ messages, as mentioned above. A “forced discovery” bit or field in both RREQ and RREP messages: When a client application forces route rediscovery, this bit should be set in the RREQ issued by the client node ODR. Intermediate nodes that are not the destination node but which do have a route to the destination node should not respond with RREPs to an RREQ which has the forced discovery field set. Instead, they should continue to flood the RREQ so that it eventually reaches the destination node which will then respond with an RREP. The intermediate nodes relaying such an RREQ must update their ‘reverse’ route back to the source node accordingly, even if the new route is less efficient (i.e., has more hops) than the one they currently have in their routing table. The destination node responds to the RREQ with an RREP in which this field is also set. Intermediate nodes that receive such a forced discovery RREP must update their ‘forward’ route to the destination node accordingly, even if the new route is less efficient (i.e., has more hops) than the one they currently have in their routing table. This behaviour will cause a forced discovery RREQ to be responded to only by the destination node itself and not any other node, and will cause intermediate nodes to update their routing tables to both source and destination nodes in accordance with the latest routing information received, to cover the possibility that older routes are no longer valid because nodes and/or links along their paths have gone down. A type 2, application payload, message needs to contain the following type of information : type = 2 ‘canonical’ IP address of source node ‘port’ number of source application process (This, of course, is not a real port number in the TCP/UDP sense, but simply a value that ODR at the source node uses to designate the sun_path name for the source application’s domain socket.) ‘canonical’ IP address of destination node ‘port’ number of destination application process (This is passed to ODR by the application process at the source node when it calls msg_send. Its designates the sun_path name for an application’s domain socket at the destination node.) hop count (This starts at 0 and is incremented by 1 at each hop so that ODR can make use of the message to update its routing table, as discussed above.) number of bytes in application message The fields above essentially constitute a ‘header’ for the ODR message. Note that fields which you choose to have carry numeric values (rather than ascii characters, for example) must be in network byte order. ODR-defined numeric-valued fields in type 0, RREQ, and type 1, RREP, messages must, of course, also be in network byte order. Also note that only the ‘canonical’ IP addresses are used for the source and destination nodes in the ODR header. The same has to be true in the headers for type 0, RREQ, and type 1, RREP, messages. The general rule is that ODR messages only carry ‘canonical’ IP node addresses. The last field in the type 2 ODR message is essentially the data payload of the message. application message given in the call to msg_send An ODR protocol message is encapsulated as the data payload of an Ethernet frame whose header it fills in as follows : source address = Ethernet address of outgoing interface of the current node where ODR is processing the message. destination address = Ethernet broadcast address for type 0 messages; Ethernet address of next hop node for type 1 & 2 messages. protocol field = protocol value for the ODR PF_PACKET socket(s). Last but not least, whenever ODR writes an Ethernet frame out through its socket, it prints out on stdout the message ODR at node vm i1 : sending frame hdr src vm i1 dest addr ODR msg type n src vm i2 dest vm i3 where addr is in presentation format (i.e., hexadecimal xx:xx:xx:xx:xx:xx) and gives the destination Ethernet address in the outgoing frame header. Other nodes in the message should be identified by their vm name. A message should be printed out for each packet sent out on a distinct interface. ODR and the API When the ODR process first starts, it must construct a table in which it enters all well-known ‘port’ numbers and their corresponding sun_path names. These will constitute permanent entries in the table. Thereafter, whenever it reads a message off its domain socket, it must obtain the sun_path name for the peer process socket and check whether that name is entered in the table. If not, it must select an ‘ephemeral’ ‘port’ value by which to designate the peer sun_path name and enter the pair < port value , sun_path name > into the table. Such entries cannot be permanent otherwise the table will grow unboundedly in time, with entries surviving for ever, beyond the peer processes’ demise. We must associate a time_to_live field with a non-permanent table entry, and purge the entry if nothing is heard from the peer for that amount of time. Every time a peer process for which a non-permanent table entry exists communicates with ODR, its time_to_live value should be reinitialized. Note that when ODR writes to a peer, it is possible for the write to fail because the peer does not exist : it could be a ‘well-known’ service that is not running, or we could be in the interval between a process with a non-permanent table entry terminating and the expiration of its time_to_live value. Notes A proper implementation of ODR would probably require that RREQ and RREP messages be backed up by some kind of timeout and retransmission mechanism since the network transmission environment is not reliable. This would considerably complicate the implementation (because at any given moment, a node could have multiple RREQs that it has flooded out, but for which it has still not received RREPs; the situation is further complicated by the fact that not all intermediate nodes receiving and relaying RREQs necessarily lie on a path to the destination, and therefore should expect to receive RREPs), and, learning-wise, would not add much to the experience you should have gained from Assignment 2.

Introduction Note: This edition of the book is the same as The Rust Programming Language available in print and ebook format from No Starch Press. Welcome to The Rust Programming Language, an introductory book about Rust. The Rust programming language helps you write faster, more reliable software. High-level ergonomics and low-level control are often at odds in programming language design; Rust challenges that conflict. Through balancing powerful technical capacity and a great developer experience, Rust gives you the option to control low-level details (such as memory usage) without all the hassle traditionally associated with such control. Who Rust Is For Rust is ideal for many people for a variety of reasons. Let’s look at a few of the most important groups. Teams of Developers Rust is proving to be a productive tool for collaborating among large teams of developers with varying levels of systems programming knowledge. Low-level code is prone to a variety of subtle bugs, which in most other languages can be caught only through extensive testing and careful code review by experienced developers. In Rust, the compiler plays a gatekeeper role by refusing to compile code with these elusive bugs, including concurrency bugs. By working alongside the compiler, the team can spend their time focusing on the program’s logic rather than chasing down bugs. Rust also brings contemporary developer tools to the systems programming world: Cargo, the included dependency manager and build tool, makes adding, compiling, and managing dependencies painless and consistent across the Rust ecosystem. Rustfmt ensures a consistent coding style across developers. The Rust Language Server powers Integrated Development Environment (IDE) integration for code completion and inline error messages. By using these and other tools in the Rust ecosystem, developers can be productive while writing systems-level code. Students Rust is for students and those who are interested in learning about systems concepts. Using Rust, many people have learned about topics like operating systems development. The community is very welcoming and happy to answer student questions. Through efforts such as this book, the Rust teams want to make systems concepts more accessible to more people, especially those new to programming. Companies Hundreds of companies, large and small, use Rust in production for a variety of tasks. Those tasks include command line tools, web services, DevOps tooling, embedded devices, audio and video analysis and transcoding, cryptocurrencies, bioinformatics, search engines, Internet of Things applications, machine learning, and even major parts of the Firefox web browser. Open Source Developers Rust is for people who want to build the Rust programming language, community, developer tools, and libraries. We’d love to have you contribute to the Rust language. People Who Value Speed and Stability Rust is for people who crave speed and stability in a language. By speed, we mean the speed of the programs that you can create with Rust and the speed at which Rust lets you write them. The Rust compiler’s checks ensure stability through feature additions and refactoring. This is in contrast to the brittle legacy code in languages without these checks, which developers are often afraid to modify. By striving for zero-cost abstractions, higher-level features that compile to lower-level code as fast as code written manually, Rust endeavors to make safe code be fast code as well. The Rust language hopes to support many other users as well; those mentioned here are merely some of the biggest stakeholders. Overall, Rust’s greatest ambition is to eliminate the trade-offs that programmers have accepted for decades by providing safety and productivity, speed and ergonomics. Give Rust a try and see if its choices work for you. Who This Book Is For This book assumes that you’ve written code in another programming language but doesn’t make any assumptions about which one. We’ve tried to make the material broadly accessible to those from a wide variety of programming backgrounds. We don’t spend a lot of time talking about what programming is or how to think about it. If you’re entirely new to programming, you would be better served by reading a book that specifically provides an introduction to programming. How to Use This Book In general, this book assumes that you’re reading it in sequence from front to back. Later chapters build on concepts in earlier chapters, and earlier chapters might not delve into details on a topic; we typically revisit the topic in a later chapter. You’ll find two kinds of chapters in this book: concept chapters and project chapters. In concept chapters, you’ll learn about an aspect of Rust. In project chapters, we’ll build small programs together, applying what you’ve learned so far. Chapters 2, 12, and 20 are project chapters; the rest are concept chapters. Chapter 1 explains how to install Rust, how to write a Hello, world! program, and how to use Cargo, Rust’s package manager and build tool. Chapter 2 is a hands-on introduction to the Rust language. Here we cover concepts at a high level, and later chapters will provide additional detail. If you want to get your hands dirty right away, Chapter 2 is the place for that. At first, you might even want to skip Chapter 3, which covers Rust features similar to those of other programming languages, and head straight to Chapter 4 to learn about Rust’s ownership system. However, if you’re a particularly meticulous learner who prefers to learn every detail before moving on to the next, you might want to skip Chapter 2 and go straight to Chapter 3, returning to Chapter 2 when you’d like to work on a project applying the details you’ve learned. Chapter 5 discusses structs and methods, and Chapter 6 covers enums, match expressions, and the if let control flow construct. You’ll use structs and enums to make custom types in Rust. In Chapter 7, you’ll learn about Rust’s module system and about privacy rules for organizing your code and its public Application Programming Interface (API). Chapter 8 discusses some common collection data structures that the standard library provides, such as vectors, strings, and hash maps. Chapter 9 explores Rust’s error-handling philosophy and techniques. Chapter 10 digs into generics, traits, and lifetimes, which give you the power to define code that applies to multiple types. Chapter 11 is all about testing, which even with Rust’s safety guarantees is necessary to ensure your program’s logic is correct. In Chapter 12, we’ll build our own implementation of a subset of functionality from the grep command line tool that searches for text within files. For this, we’ll use many of the concepts we discussed in the previous chapters. Chapter 13 explores closures and iterators: features of Rust that come from functional programming languages. In Chapter 14, we’ll examine Cargo in more depth and talk about best practices for sharing your libraries with others. Chapter 15 discusses smart pointers that the standard library provides and the traits that enable their functionality. In Chapter 16, we’ll walk through different models of concurrent programming and talk about how Rust helps you to program in multiple threads fearlessly. Chapter 17 looks at how Rust idioms compare to object-oriented programming principles you might be familiar with. Chapter 18 is a reference on patterns and pattern matching, which are powerful ways of expressing ideas throughout Rust programs. Chapter 19 contains a smorgasbord of advanced topics of interest, including unsafe Rust, macros, and more about lifetimes, traits, types, functions, and closures. In Chapter 20, we’ll complete a project in which we’ll implement a low-level multithreaded web server! Finally, some appendixes contain useful information about the language in a more reference-like format. Appendix A covers Rust’s keywords, Appendix B covers Rust’s operators and symbols, Appendix C covers derivable traits provided by the standard library, Appendix D covers some useful development tools, and Appendix E explains Rust editions. There is no wrong way to read this book: if you want to skip ahead, go for it! You might have to jump back to earlier chapters if you experience any confusion. But do whatever works for you. An important part of the process of learning Rust is learning how to read the error messages the compiler displays: these will guide you toward working code. As such, we’ll provide many examples that don’t compile along with the error message the compiler will show you in each situation. Know that if you enter and run a random example, it may not compile! Make sure you read the surrounding text to see whether the example you’re trying to run is meant to error. Ferris will also help you distinguish code that isn’t meant to work:

SQL Injection attack is the most common website hacking technique. Most websites use Structured Query Language (SQL) to interact with databases. SQL allows the website to create, retrieve, update, and delete database records. It used for everything from logging a user into the website to storing details of an eCommerce transaction. An SQL injection attack places SQL into a web form in an attempt to get the application to run it. For example, instead of typing plain text into a username or password field, a hacker may type in ‘ OR 1=1. If the application appends this string directly to an SQL command that is designed to check if a user exists in the database, it will always return true. This can allow a hacker to gain access to a restricted section of a website. Other SQL injection attacks can be used to delete data from the database or insert new data. Hackers sometimes use automated tools to perform SQL injections on remote websites. They will scan thousands of websites, testing many types of injection attacks until they are successful. SQL injection attacks can be prevented by correctly filtering user input. Most programming languages have special functions to safely handle user input that is going to be used in an SQL query.

‘Generative House Algorithm’ was constructed for one simple reason, being one click away from creating a range of uniquely designed model houses. At the beginning of 2020, the start of the covid-19 pandemic, I started learning programming. My background is in developing 3D motion graphics, but my work goes into different directions. I feel inspired by trying out new things, but often feel constrained by the software I use. I never found the right software that could satisfy my every need. A few years back, I visited a motion graphics event in Prague. Here I saw a presentation by Simon Homedal from Man vs. Machine and he introduced me to procedural programming for digital art. And so my journey into learning to code started. Being stuck at home because of covid-19, I was presented with a change to really jump in and start developing a few coding projects. I started out with a simple board game in Java, where I was introduced to ‘object oriented programming’ and UI development and many other general concepts. At the end of this project I came to the conclusion that simple programming is not enough, I needed to combine with something I already have experience of. So I started using Python inside Maya, focusing on asset development of simple programs I could execute whenever I’m working on a 3D project. At the time I was wondering if I could deconstruct houses to an algorithm. The inspiration for this project came from wandering around the residential areas where I lived. Zandberg has very diverse styles of architecture; Terrace houses with high ceilings, classical villas with roofs made of straw and modern villas built after WWII. I was captivated by the diversity in design. Breakdown A simple UI inside Maya, where the uses can specify the value for generating a number of houses. Simple things like level and roof height, number of doors, max number of levels, etc. Lastly a button that would take in the value and run the algorithm. The back-end consists of a number of Python modules, textures and .obj files. One Python file called the “Main”, is where the files are assembled and executed. Process Developing a generative algorithm is a process of trial and error. At the start of the project I treated the project like any other modeling project, only every design decision was programmed in with a number of possible solutions. Over time this would become very complex and unstructured. It became impossible to go back and modify what I already wrote down. Another problem was that the algorithm was creating the model for running the code. This meant that selecting, adding and subtracting mesh to the model cost a lot of processing power, to the point my computer would freeze up. I needed to rethink my process and develop a framework which is easy to modify and light on the processor. My new plan of attack was to do as little as possible in Maya. All design instructions needed to be solved before anything can be created in Maya. Going into this direction was a hard choice. First off, it’s not a guarantee for success. The moment I would go too deep, things can get messy very easily. Besides I consider myself more of a visual thinker. Working outside of Maya meant every hurdle would be some sort of math problem. I already knew I had no choice, and understood this is the type of problem solving a programmer has to deal with. So I started out doing a little bit of RnD. My first test was to create a number of lists. Generally every list would hold some type of value. Like positional data, labels, dimensions, objects etc. and the rest would be a range of functions iterating, generating, gathering, and sorting data into these lists. These seemed flexible enough, if I needed to add new details to the model, I would make a new list and apply this into the framework. This type of framework was not very structured as I hoped. Luckily I discarded this ideal before it really began. I was already attracted by the idea of using a matrix instead of lists at the top of lists. The matrix would provide data in three dimensions, like a volume or a box made out of separate units. I would add an extra dimension to each unit, which is a list of six values. Each value would represent each side of a unit. The general ideal of a matrix is like a fluid simulation, which is made out of a matrix of voxels, or like Minecraft where each unit can be some type of block. This would create a data structure that is easy to modify. The next step would be to feed the matrix with values. A value can represent walls, doors, windows, levels, rooftops, position and direction. It starts with an empty matrix, and secondly fill it with values of 1 (later on inside Maya, value 1 would generate a wall, the location within the matrix would be translated to 3D space). If you’d stop here and translate the matrix to mesh in Maya, you would get a cluster of boxes stacked next or on top of each other. Adding more data to the matrix meant it needed to structure itself, so it would generate a cohesive design. If not the final result would be a house with holes in the wall or floating rooms. Therefore a number of functions are needed for searching for patterns, and modifying the data. A standard function would iterate over each unit in the matrix and check the neighboring values. If some sort of condition is met, the proper value will be modified. Going back to our cluster of boxes example. If a has a neighbouring box in front and to the left, but nothing on top, this would be a condition where a corner roof would be generated. And so different functions would solve design problems. In the end you would be left with a matrix of values that would serve as a blueprint for generating in house inside Maya. Finally the model needs to be made in Maya. A number of parts like a wall, door or window are generated or imported in Maya. When iterating over the finished matrix, a certain value in a certain place in the matrix will decide which objects (example wall or roof) needs to be instanced and placed in the right position and direction. When the matrix is fully realised in Maya the model gets a final cleanup, by merging the model, deleting unused parts and empty groups. What is left is the house model. If a range of houses needs to be generated, the process is simply looped over a number of times. Final word This project took way longer than I had anticipated and is far from finished. I learned a lot and at the same time it feels like I have only just begun. I hope to pick up this project again in the near future. I would love to add more elements to the house, like roof-windows or balconies and create procedural shaders. And possibly try out machine learning or some type of genetic algorithm. If you have any questions or are intrigued please contact me at ljh.hartman@gmail.com. Cheers!

NodeJS Clean Architecture. Clean Architecture is an opinionated boilerplate for Node web APIs focused on separation of concerns and scalability with Uncle Bob Clean Architecture implementation. Features: > Union - Layered folder structure: code organization focused on codebase scalability. > Instant feedback and reload: use Nodemon to automatically reload the server after a file change when on development mode, makes the development faster and easier. > Scalable and easy to use web server. > Use Express for requests routing and middlewares. There are some essential middlewares for web APIs already setup, like body-parser, compression, and method-override. > Database integration: Mongoose, a MongoDB Database Connection, is already integrated; you just have to set the authentication configurations. > Prepared for testing: The test suite uses Mocha, Chai and is prepared to run unit, integration and functional tests right from the beginning. A FactoryGirl adapter for Mongo is setup to make your tests DRY as well, and the tests generate code coverage measurement with. You should read about the Chai plugins that are setup by default too. > Dependency injection: With Awilix, a practical dependency injection library, the code will not be coupled and it'll still be easy to resolve automatically the dependencies on the runtime and mock them during the tests. It's even possible inject dependencies on your controllers with the Awilix Express adapter. >Logging: The Log4js logger is highly pluggable, being able to append the messages to a file during the development and send them to a logging service when on production. Even the requests (through Morgan) and queries will be logged. > Linter: It's also setup with ESLint to make it easy to ensure a code styling and find code smells. How to use: Notice that the boilerplate comes with a small application for user management already; you can delete it with a npm script after you understand how the boilerplate works but please do the quick start first! 1. Clone the repository. 2. Setup the database on `config/database.js` (there's an example file there to be used with MongoDB). 3. Install the dependencies with `yarn`. 4. Create the development and test databases you have setup on `config/database.js` 5. Run the application in development mode with `npm run dev` 6. Access `http://localhost:3000/api/users` and you're ready to go! Compiled and presented by Vakindu Philliam.

🚀 Java & Spring Boot Learning Warehouse. Welcome! This repository is your go-to resource for mastering Java and Spring Boot, from basics to advanced concepts. Find structured paths, practical examples, and best practices to enhance your skills. Join us to become a proficient Java developer!

As a digital marketing company, we have actually driven numerous web site hits, millions of leads as well as also millions of sales. So if you are a local business or a young expert that wants to find out more about marketing management, then you remain in the best place. Today, we're reviewing exactly how advertising managers can develop effective projects, detailed. Our digital marketing firm saves small companies from bad advertising as well as no development, yet of course, in order to do that effectively, our advertising and marketing supervisors have to have extraordinary skills around marketing monitoring. Regrettably, a great deal of the schools today are instructing out-of-date advertising and marketing techniques. As well as the net is swamped with phony experts who show marketing however in fact have no actual experience. This can be an easy catch for anyone just beginning to seek aid regarding the globe of marketing. That's why you should pick up from individuals who have actual experience As Well As can confirm it for greater than one firm. And also these are simply results we've gotten for our firm, using our very own techniques. We have more than 10,000 hrs of actual digital marketing experience and also have aided thousands of business find the very best options to their advertising issues. Just how have we managed to do this? Via our team of marketer! In order for them to offer these efficient options, our marketing supervisors need to have outstanding abilities around marketing administration. And those abilities are precisely what our advertising and marketing supervisors have. We're mosting likely to give you some powerful techniques if you want to learn advertising and marketing monitoring or become a much better marketing manager. In this blog, you will certainly learn exactly how advertising managers can develop effective campaigns, step-by-step. We will certainly discuss: 1. Just how to onboard a brand-new marketing project 2. Just how to structure your strategy 3. How to setup everything 4. And much more! Without further trouble, let's go ahead as well as dive in with action # 1. Action 1: How to onboard a brand-new advertising project Whether you are beginning a new marketing campaign from square one or you are inheriting an existing advertising campaign, it is really important to recognize 2 things. # 1 You require to develop your advertising goals. Now usually we have clients that will certainly claim their objective is to obtain more sales. Yet that is an extremely high-level goal. With that, you'll intend to unbox your goal into something more workable. To break down your objective into actionable parts, we will certainly start to speak about leading as well as lagging indicators. A lagging indicator is normally a result, such as more sales, even more leads, or more web traffic, which are great objectives to have. Yet in order to get to an outcome or a lagging indication, you need a leading indication which is typically an action. Leading signs are points that you can regulate now everyday or each week. And these are the advertising and marketing objectives that you want to develop. As a marketing manager, you need to understand both leading and lagging objectives. # 2 You need to understand your budget. When you onboard an advertising and marketing campaign, you require to understand your campaign budget. If you are unclear about your marketing spending plan or about just how to accurately calculate your marketing budget, we have a thorough video clip that can help you here. Ultimately, the important point below is that you intend to make sure your budget plan matches your objectives. For that reason, if you desire $1 million in sales for instance, then you require to be all set to spend thousands of thousands of dollars. And also honestly, you wish to be as sensible as possible because that's the accountable thing to do as a great online marketer. A lot of people strive for the over night success desire, however the fact is excellent marketing can require time. Now that you have established you require to establish some advertising goals and also a spending plan, after that you can transfer to tip number two, which is "just how to structure your advertising strategy." Action 2: Exactly how to structure your advertising plan The first thing we suggest that you do is to develop an advertising and marketing channel, or really plainly recognize the advertising and marketing channel that already exists. If your business is already generating any type of sales, after that you likely have an advertising and marketing channel whether you understand it or not. It is necessary to recognize which part of the funnel you will certainly need to influence with your advertising project. Understanding the advertising channel will help you pinpoint which stage of the channel demands adjustments. To get a far better understanding of the advertising and marketing channel, let's take a more detailed look at an advertising funnel as well as break down an advertising funnel for B2C (service to customer) as well as B2B (organization to service) firms. At the top of the channel you have the recognition stage. For both B2B or B2C companies this is where potential consumers become aware of your company either by means of search, or an advertisement, or a person referring them to you. The next part of the channel is the interest stage. This is where your capacity clients start to read more concerning your product and services. After that phase of the channel is the consideration stage. This is where your capacity customers actually begin thinking about buying your products. They might begin to review your evaluations or compare your products to others that are on the market. After the consideration stage is the intent phase. This is the stage where the potential client prepares to buy as well as simply needs a little push to complete the transaction. If you're a B2C firm, that implies that a visitor has perhaps added something to their cart. And also if you're a B2B firm, that implies that a site visitor may have asked for a meeting or a live trial. Swiftly after that, the prospective consumer enters the examination stage. This is when the potential consumer is considering the experience they are having as they are having a look at for a B2C company or finishing the contract for a B2B firm. At the really bottom of the channel you have the actual purchase, which is when the potential client becomes a real consumer. As you can see, there is a whole process to getting a client to really end up being a client. On top of that, a channel can continue after the acquisition factor, particularly if you wish to get even more sales from your present consumers. However those phases we pointed out are mosting likely to be the major locations that the majority of marketing managers require to focus on. Nevertheless, if you wish to discover a bit a lot more concerning marketing funnels, check out this blog where we go a lot more thorough with the advertising and marketing channel phases. As you are doing your marketing administration, you wish to begin asking on your own, "Which stage in the advertising and marketing channel does my organization require the most assist with?" You will discover that some business require general understanding prior to they can enhance any other part of their funnel. You may additionally locate that some business have a lot of awareness, yet battle to convert those introduce sales. However, once you recognize where your marketing needs one of the most aid, then you can concentrate there and also start to establish those leading indication objectives. For example, in the recognition stage, you have to focus on getting to a great deal of people. And also if business spending plan you have actually established is reduced, that suggests you will likely require to make use of an organic advertising and marketing approach. Currently let's move on to tip number three, which is just how to establish your advertising and marketing projects Action 3: How to set up your marketing campaigns. The first thing you need to think of below is production. What we indicate by "production" is you need to understand WHO or WHAT you require and WHEN you require it. To figure this out, go back to your leading indications and think about just how you are mosting likely to complete them. Possibly you need a web content writer, a designer, or a marketing spending plan. Or perhaps you require to set aside a couple of hours a day, to hire an agency, or a few other tools to aid you be reliable. The bottom line is, you need to be extremely clear about what deliverables you need as well as when you require them. After manufacturing, we recommend that you track your development. Since doesn't mean you are seeking that delayed indication or that major result that you wish to accomplish. Rather, you'll want to track whether or not your growth is headed in a positive instructions. Ideally, it's very easy to determine a trend line that is going up overtime. For example, if you are publishing on YouTube on a daily basis for six months as well as you are not obtaining any kind of sights whatsoever, then that is an indication that you require to quit and reassess your advertising strategy. One of our company's favorite tools to make use of to track development is Google Analytics. It's very simple to set up on your own as well as ought to take you no time to obtain arrangement and start. As soon as you're set up for success with Google Analytics, you can go on to tip number four, which isn't truly an action however it is a crucial idea to live by. Step 4: Stay with your strategy We have actually stated it before however excellent advertising takes some time. We can't emphasize this sufficient. Unless you have a really large spending plan, we're speaking at the very least $100,000 a year, then you greater than likely will require to focus on one point at a time. That means you wish to put together a really great approach and make sure it functions PRIOR TO you proceed to something that is new and also stylish right now. We suggest you give your technique a minimum of 6 months before you quit. And this is six months of pure quality! That means you are not missing out on due dates and you are putting together an excellent amount of quantity and also top quality work. Bear in mind to still be tracking your outcomes and making sure you're constructing some energy or seeing a positive trend line. Even if the positive trend line is slow, it is still positive. Now allow's go on to our last step. Tip 5: Reporting If you are doing any type of type of advertising and marketing management or if you are an advertising and marketing supervisor on your own, after that at some time you will require to do some reporting. Whether you are reporting to yourself, stakeholders, a supervisor, or a customer, this is an area where you require to successfully interact just how your advertising and marketing is going. When you are connecting, you need to recognize your target market. If you are speaking to an additional advertising and marketing professional or somebody with an advertising background, after that you can possibly utilize more advanced descriptions of your development. However if you are speaking with someone that does not know a lot regarding advertising, after that you want to try to simplify as simply as possible. For instance, you would not begin speaking to a stranger about ROAS, ROI, conversion projects, as well as lead-to-sale conversions since there's a slim chance they would understand what you were discussing. Everything that we cover in this blog are points that you wish to communicate to whoever you are reporting to. To make sure that suggests you want to relate things back to the goals, the budget, the channel, and the positive pattern line. You'll see that poor marketing professionals only care about telling you just how good their negative results are. A bad marketing professional will tell you about all the leads they have actually created but have really little results for conversions. As good marketers, it is our obligation to interact successfully as well as with honesty. So understand your numbers, know your target market, as well as be as clear as possible whether the results are good or bad. Establishing in-depth records that are comprehensive sufficient for your audience to recognize is what will assist everyone be on the very same web page. Verdict There you have it-- 5 truly awesome suggestions for advertising monitoring. Tips that we stand by and are confirmed due to the fact that we've used them for our own advertising and marketing projects. In addition, we have actually managed campaigns for our customers that have actually driven numerous hits, numerous leads, and countless sales. That's why we believe you can stand by these important pointers we have actually supplied here.And there's so much extra you can learn more about advertising and marketing for your business! Whether you are a small company proprietor or a young specialist that intends to find out more concerning advertising and marketing administration, after that you remain in the right area. Our group of marketer prepare to help you make on your own a better marketer!

The Best Antivirus and Total Protection for Mac! What's the Best Malware Protection? Malware, Spyware, and Adware Protection Antivirus programming is basic for each PC. Without it, you hazard losing your own data, your records, and even the money from your financial balance. We've tried in excess of 40 utilities to enable you to pick the best antivirus security for your PCs. Malware, Spyware, and Adware Protection Summer is practically here, and we're all anticipating a stunning get-away, be it at the shoreline, in the mountains, or even on a journey. Malware coders get-aways, as well. Theirs is an occupation, similar to some other, from numerous points of view. In any case, that doesn't mean you'll be sheltered from infections, ransomware, bots, and other malware this late spring. The malware office director timetables get-aways, much the same as any office supervisor, to ensure someone's at work, making new assaults on your gadgets and your information. Before you head out, check your antivirus membership to ensure it won't take its very own get-away soon. In case you're not ensured at this point, put introducing an antivirus on your agenda. We've tried and McAfee com activate antivirus instruments so you can pick one and unwind with no stresses. We call it antivirus, yet in truth it's far-fetched you'll get hit with a real PC infection. Malware nowadays is tied in with profiting, and there's no simple method to take advantage of spreading an infection. Ransomware and information taking Trojans are considerably more typical, as are bots that let the bot-herder lease your PC for loathsome purposes. Current antivirus utilities handle Trojans, rootkits, spyware, adware, ransomware, and that's only the tip of the iceberg. PCMag has explored in excess of 40 distinctive business antivirus utilities, and that is not notwithstanding checking the many free antivirus devices. Out of that broad field we've named fourEditors' Choice items. mcafee activate product key antivirus utilities demonstrated powerful enough to procure an astounding four-star rating nearby their progressively conventional partners. VoodooSoft VoodooShield puts together its security with respect to stifling every obscure program while the PC is in a powerless state, for example, when it's associated with the web, and furthermore acts to identify known malware. The Kure resets the PC to a known safe state on each reboot, consequently wiping out any malware. On the off chance that you have malware, one of the ten items in the graph above should deal with the issue. You may see that one item in the outline earned simply 3.5 stars. The diagram had space for one more, and of the seven 3.5-star items, the labs just focus on F-Secure and G Data. F-Secure has the additional fillip of costing the equivalent for three licenses as most items charge for only one, so it advanced into the diagram. The blurbs at the base of this article incorporate each business antivirus that earned 3.5 stars or better. www.mcafee.com/activate offer insurance past the antivirus incorporated with Windows 10; the best free antivirus utilities additionally offer more. In any case, Microsoft Windows Defender Security Center is looking somewhat better recently, with some awesome scores from free testing labs. In our grasp on tests, it demonstrated a checked improvement since our past audit, enough to at long last bring it up to three stars. Tune in to the Labs We take the outcomes announced by free antivirus testing labs in all respects truly. The basic reality that a specific merchant's item appears in the outcomes is a demonstration of positive support, of sorts. It implies the lab considered the item huge, and the merchant felt the expense of testing was advantageous. Obviously, getting great scores in the tests is additionally significant. We pursue four labs that normally discharge nitty gritty reports: SE Labs, AV-Test Institute, MRG-Effitas, and AV-Comparatives. We likewise note whether sellers have contracted with ICSA Labs and West Coast labs for affirmation. We Test Malware, Spyware, and Adware Defenses We additionally subject each item to our very own hands-on trial of malware assurance, to a limited extent to get an inclination for how the item functions. Contingent upon how altogether the item averts malware establishment, it can acquire up to 10 for malware assurance. Our malware assurance test fundamentally utilizes a similar arrangement of tests for quite a long time. To check an item's treatment of fresh out of the box new malware, we test every item utilizing 100 amazingly new malware-facilitating URLs provided by MRG-Effitas, taking note of what level of them it blocked. Items get equivalent kudos for anticipating all entrance to the vindictive URL and for clearing out the malware during download. A few items win completely outstanding evaluations from the autonomous labs, yet don't toll too in our grasp on tests. In such cases, we concede to the labs, as they carry altogether more prominent assets to their testing. Need to know more? You can dive in for a point by point portrayal of how we test security programming. Multilayered Malware Protection Antivirus items separate themselves by going past the fundamentals of on-request examining and ongoing malware insurance. Some rate URLs that you visit or that appear in indexed lists, utilizing a red-yellow-green shading coding framework. Some effectively square procedures on your framework from associating with known malware-facilitating URLs or with false (phishing) pages. Programming has imperfections, and here and there those blemishes influence your mcafee security. Judicious clients keep Windows and all projects fixed, fixing those imperfections at the earliest opportunity. The defenselessness output offered by some antivirus items can check that every vital patches are available, and even apply any that are absent. Spyware comes in numerous structures, from concealed projects that log your each keystroke to Trojans that take on the appearance of legitimate projects while mining your own information. Any antivirus should deal with spyware, alongside every other sort of malware, yet some incorporate specific segments gave to spyware insurance. You expect an antivirus to recognize and dispose of terrible projects, and to disregard great projects. Shouldn't something be said about questions, programs it can't distinguish as positive or negative? Conduct based discovery can, in principle, secure you against malware that is so new scientists have never experienced it. In any case, this isn't generally an unmixed gift. It's normal for social discovery frameworks to hail numerous harmless practices performed by genuine projects. Whitelisting is another way to deal with the issue of obscure projects. A whitelist-based security framework just permits realized great projects to run. Questions are prohibited. This mode sometimes falls short for all circumstances, however it very well may be helpful. Sandboxing gives obscure projects a chance to run, however it segregates them from full access to your framework, so they can't do lasting damage. These different added layers serve to upgrade your assurance against malware. What's the Best Malware Protection? mcafee.com/activate antivirus would it be advisable for you to pick? You have an abundance of choices. Kaspersky Anti-Virus and Bitdefender Antivirus Plus routinely take impeccable or close ideal scores from the autonomous antivirus testing labs. A solitary membership for AntiVirus Plus gives you a chance to introduce security on the majority of your Windows, Android, Mac OS, and iOS gadgets. What's more, its unordinary conduct based recognition innovation implies Webroot SecureAnywhere Antivirus is the most diminutive antivirus around. We've named these four Editors' Choice for business antivirus, however they're by all account not the only items worth thought. Peruse the surveys of our top of the line items, and afterward settle on your own choice. Note that we have assessed a lot more antivirus utilities than we could incorporate into the diagram of top items. On the off chance that your preferred programming isn't recorded there, odds are we reviewed it. The blurbs beneath incorporate each item that oversaw 3.5 stars or better. Every one of the utilities recorded in this component are Windows antivirus applications. In case you're a macOS client, don't lose hope, be that as it may; PCMag has a different gathering devoted exclusively to the best Mac antivirus programming.

Date of Concorde In January of the year 1976 after 29 years of the first to penetrate to the speed of sound military aircraft jet - Two Concord took off together at the same time, one from London and one from Paris, the first airline service ultrasound for travelers. The aircraft Almottaghtan has looked towards the west as if they were Tgaraan - even Tsabakan - the sun. Where they arrived as if they did not Taathrca, in terms of time, in a new event launches air transport stage supersonic passenger wealthy people who do not allow them to narrow their time to stay in the air for long periods. How the project began and evolved, and how the outcome of the remaining Concorde lounges to museums ... This is what Santapah in the following lines: The emergence of the Concorde The deal "supersonic" between England and France was signed in 1962, for the design and construction of the first civilian supersonic plane manufactured by Airbus for them. After long years of arduous efforts and research strenuous, in addition to more than 5,000 hours in the air tunnels, proved to be a form of equity Almstrq with the body long cylinder for aircraft relatively large passengers, it is the best form executable command and control speeds ultrasound. The first two aircraft of this type making and Tjeribhma in 1969, and since then about 20 aircraft of this model, called the "Concord" was produced (the only civilian aircraft that exceed the speed of sound speed), and who serve in the British Airways and Air France in income 1976, the rate of seven aircraft of the British lines and five lines in French. The first fly line is the London - Singapore via Bahrain. In 1976 received Bahrain Airport very important event, which is to start regular flights between Bahrain and London, the fastest of the British Airways sound Concorde, the airport first and the only one who was receiving this type of aircraft in the Middle East, given that the Concorde need to Airports women with special specifications, so they need to take-off and landing runways longer than the regular airports runways, and the noise from the power of their engines leads to smash windows of buildings ordinary airports, and the speed has a crush Madarjha. What Concorde is distinct from other aircraft?Characterized by Concorde slim form in the form of a triangle (delta). And fly faster and higher than other aircraft altitudes, using the "upward vortex" method to accomplish extraordinary mission. For example, while the "Boeing 747" aircraft speed, better known as "jumbo" around 900 km / h (about 84.0 Mach) at an altitude of 35 thousand feet, the Concorde fly quickly 2172 km / h (Mach 2) at an altitude of 60 thousand Foot. It is known that Almaj is the real rate of speed compared to the speed of sound, and is equivalent to an average of 1225 kilometers per hour, so that the speed of sound changes with temperature change, which moves rapidly 1190 km / h at sea level, but it drops to 1060 km / h at an altitude of 36,000 feet above the ground, where the air temperature drops. Because the Place de la Concorde to fly faster than the speed of sound, they differ from the rest of the aircraft on several characteristics. First, in terms of the flow of the fuselage, where you need to own dynamic shape to face severe air resistance at these high speeds, and it is achieved by taking the body form of a high pin tapered, triangular wings tilted back, my head and a tail, and an introduction brushes can be moved to the bottom of takeoffs and landings to be able to see the pilot of the corridor, to the top during flight to improve the flow of the fuselage. Amounting to 83 feet and 8 inches tall plane wings in the company "Oarossbesiak" has produced and supplied surfaces work together Kdvh depth, also works differentially Kjnahat. There is no tip installed inside the concavity of the wing, but no spire parties descend and spin at the same time. The second difference is related engines, where the Concorde's engines proved directly in the wings to avoid the use of any parts of the conductive would crash at high speeds, and the engine fitted with a special friendly hotel to exploit the resulting exhaust for initial combustion cycle combustion again mixing with more new fuel to increase efficient engines and power, where this process provides the engine in the final stage of heating fuel for the production of the required additional power for takeoff and the transition from one phase to the heating of supersonic flight, allowing aircraft takeoff speed of 360 km / h. The useful load carried by the Concorde's less than a third of what was done other than in the weight of the jets under the sound, so it was no reduction in the efficiency of the engine, it is actually the difference between profit and loss. Every Concorde has supplied four-engine aircraft, "Snecma Olympus DS 593," the momentum of 17259 kg. The company "Rolls Royce" design engines, which provided all Dagtin separate engine in order to fuel economy. Each engine and also provided additional Aq. Engine reverse payment system is also equipped. On the other hand, the Concorde is distinct from other aircraft fuel tanks and the presence of more and larger, with four engines burn a tremendous amount of kerosene has more than 25 thousand liters per flight hour. However, the fuel tanks lead a purpose whatever else, which is to maintain the equilibrium plane, where the center to raise the plane travels at high speeds for its center of gravity and then you move amounts of fuel between private additional tanks at the front of the plane and the rear to offset that effect, and returned those quantities at low speed in preparation for landing to bring the situation back to its origin. For example, a flight plan requires the distance between Paris and the French coast on the Atlantic equator at less than the speed of sound speed is determined to 0.93 Mach, to be at the height of about 9000 meters, after which the plane begins to jump quickly to reach the speed of take-off and altitude wanted, it performs speed between the two situations difference to a change in the dynamics of the plane to move from the airline less than the sound quickly to other higher speed of sound, and to overcome this situation, the transfer of fuel in an aircraft using a payment of reservoirs located in the introduction to the reservoirs in the system rear. During the transitional situation between the two modes of ex (between Mach 1 and Mach 1.6) increases air resistance sharply, and at this moment is to break the sound barrier. Once access to 1.7 Mach the captain to stop the internal combustion process, after more than a very plane speed of up to Mach 2, or 2200 km / h, more than twice the speed of sound, which represent the target aircraft speed, while the estimated target of 16000 and 18000 meters altitude. But when approaching landing, the fuel will move to the front of the plane, and the concomitant rise in the plane's nose, to land the plane in a scene it looks like a bird landing on the surface of the water. Finally remains the difference in the fuselage coating, where the Concorde is exposed at high speeds to a very large rise in body temperature as a result of increased friction of air molecules, so they coated special material properties and reflective stronger than those in the other aircraft, capable of dispersing such high temperatures . The fuselage itself is made from a special metal is characterized by a greater capacity to withstand the heat and stress resistance resulting from inflation fuselage resulting in turn from high temperature. The speed of the plane have been identified in the horizontal flight Mach 2.2, which is just before the thermal barrier (which is the speed at which if exceeded temperature increases dramatically), but it has identified the chronological age of the structure of 60,000 flight hours. And making the structure of the aluminum-alloy steel by thermal changes from -35 degrees to +120 degrees, as the flight above the speed limit of the plane requires that the structure is made with a mixture of steel and titanium, which means more weight. Fly the Concorde at the highest altitudes of 50,000 feet, where the air is equal to a tenth of what Tsawiyeh at sea density, and the temperature at that very low altitude, and despite all this work ultrasonic motors with high efficiency. According to reports of the pilots can handle the plane easily. The acceleration of the aircraft and transit speeds TransitionAnd what is characterized travel Balkounkord from other aircraft? Accommodate the Concorde for a hundred passengers and crew consists of a pilot and a flight engineer and his assistant in addition to the six hosts. When quitting, the passenger feels strongly pay back as a result of the launch aircraft from sleep to the speed of 362 km / h in just 30 seconds, which is called the Earth's gravitational force, and quickly reach the maximum height of the plane and penetrate the speed of the sound barrier. In all the flight times travelers can know the speed, through a private display panel installed in front of them, and are entitled to see the curve of the globe and Northern Lights because of the high altitude, which is flying the plane. Travelers can also watch the first layer colors of the atmosphere, where the height of the plane boundary between the first two Tbaktah. It takes Atlantic crossing Balkounkord three and a half hours only, while the that time about nine hours in the other underneath the aircraft sounds. And up the Concorde passengers who starts his journey from London at ten thirty in the morning to New York at nine thirty in the morning, before the date of its launch radios. This of course does not mean a retreat in time, but due to time differences and the short flight time! Over the last quarter-century, Concorde was the five weekly flights between Paris and New York in a record speed of less than 4 hours, at which time it cut the best of conventional aircraft, the same distance in 8 hours. He was landing at Kennedy Airport (according to US time) at eight in the morning, and exiting back to France at the eleventh hour before noon, where businessmen French used to negotiate with the Americans their customers at the airport Salons, without having to go to the business and financial district in Manhattan, and then return to Paris the same day. And to what the fate of the Concorde? I tried both the US and Soviet governments (former) develop similar Balkounkord aircraft, but those attempts ended in retreat, either because the magnitude of the required expenditures on the American side, or the occurrence of accidents due to human error on the Soviet side. Some of these Soviet aircraft had stayed (model "T U-144"), as amended to date, but used in air mail services, also placed some of them in museums, while one of them devoted to project Russian joint US. And remained the Concorde, solo travel of passengers faster than the speed of sound even temporarily suspended service to make adjustments after the accident led to an explosion killed one of them and all of them were. In addition, the high run that made the ticket price between Paris, London and New York round-trip $ 10,000, which led to limited use of the rich and famous costs, as well as what caused the noise and pollution, suffered Concorde most suffered from weak passenger demand for flights, in Following the incident, which came under the air France one in Paris in July 2000 to a near Charles de Gaulle airport hotels, which led to the deaths of 109 people on board and four people on the ground. Consequently After some major attended by experts and investigators, scientists, lawyers, artists, religious leaders and industrialists from different generations, between believers technology and Muslims in terms of authority to the modern age and among those who believe that it is necessary to rein in scientific progress and the development of ethical and legal controls him, took the final decision to stop flights Place de la Concorde. In July of 2003, tens of thousands of lovers of the Concorde gathered along the road to Heathrow Airport in the fog of London, the capital, in a bid farewell final before this model withdraw aircraft from service, after it made its first commercial flight in 1976. This has three Concorde planes reviewing the air before landing at Heathrow Airport in a reference to the termination of commercial flights known aircraft at supersonic speed. And charged the British Airways Concorde plane carrying 100 special guest at the final flight, which launched from Kennedy Airport in New York towards London, penetrated the sound barrier for the last time. Upon entering British airspace acceded Two Concord British Airways, one coming from the city of Edinburgh in Scotland, and the other from the Bay of Biscay west of France. Lovers plane Odalla in July of 2003 in Paris, as well as a pool, in the last trip out between Paris and New York, after a 27-year-old was cut where the distance between the two cities in a matter of three hours and a half. Where he lined up more than 250 workers from the maintenance workers bodyguards honor of the plane at Charles de Gaulle airport, with thousands of French gathered on the edge of the airport to see the plane taking off, holding a banner reading "We love you, Concord." The French lines: that the plane Concorde belong to the humanitarian aviation heritage and must therefore provide an opportunity for more people to see it, and added that it would apply to all of the fleet of Air France Concorde aircraft, which will be displayed every aircraft in museums in France, Germany and the United States, such as the Museum aviation and aerospace in the suburb of "Le Bourget" Paris, the Museum of Aviation near the Scottish capital "Edinburgh". Parts of the plane crashed as sold at Christie's for souvenirs to those who died to travel out, varied between the nose of the plane and the door of cabin leadership and a seat pilot and antenna radar warning in which the two motors of the engines and parts of the dashboard to the instructions and cutlery dishwasher ceramic spoons and silver booklet, worth total amounted to 3.29 million euros, went in favor of a charitable institution of the air France is working in the field of care for the poor children. Last auction for the sale of pieces of a British Airways Concorde has also been established. The British and French companies have announced at the beginning of the month of April of the same year 2003, he stopped Concorde flights after the company "Airbus" that produced externa announced: What's next in the field of transport ultrasonic? American company, "Boeing" is currently working on the supersonic jet, is supposed to be placed in service during the coming years, while filling the attention of European rival, "Airbus" accomplish its flagship aircraft, "Airbus A380 (superjumbo) capable of carrying about 800 passengers, which had been achieved in 2007, while scientists tried to Japanese to develop a model of the plane was enable fly twice as fast as the Concorde, but their experience after the plane landed long model briefly after take-off from the site "Woomera" to launch rockets in the desert south of Australia, and it failed within the project included my company, "Mitsubishi heavy Industries" and "Nissan Motor." He held this paradigm of a length of 11 meters on a rocket, Plans for him to be separated from the booster rocket above the ground, and falling faster than twice the speed of sound, but it got out of control since it was launched. It was supposed to reach the aircraft remotely piloted altitude of 20 thousand meters, before Taud.aly ground faster than twice the speed of sound. The goal was to become a plane "NeXT 1" transport aircraft the fastest in the world to succeed Concorde, with the difference that it will be less noise and damaging to the environment and can accommodate up to 300 passengers: Thus crossed another Concorde SST recent trip mounted aboard a ship in the River Thames sailing from London to the Museum of Flight in Edinburgh, after he has made more than eight thousand flight during which 22 thousand and 768 hours and 56 cut-minute flight, the folded thereby separating mythic unique and important commercial aviation history, a supersonic flight, waiting for what the future holds for us of new inventions ?!

## Writeurl - an online collaborative editor ### Writeurl is a collaborative editor Writeurl is a client server system. The frontend code is written in pure javascript using no frameworks. The backend is a node.js application. The client and server communicate through a WebSocket connection. The client stores local changes in the browser's local storage. The editor can be used in offline mode. Changes are always uploaded to the server when a connection is available. Writeurl documents are identified by their (write)url: www.writeurl.com/text/id/read-password/write-password There is a read only version with a (read)url of the form www.writeurl.com/text/id/read-password This url structure makes it easy to share documents. No user registration is needed. #### Writeurl as an online service Writeurl is available as an online service at www.writeurl.com The code running the online service is the same as in this git repo. ###Local installation Writeurl can be installed and run locally as an alternative to using the online service. #### Installation instructions ##### Dependencies The only required dependeny is node.js and the modules in package.json. It is recommended to use node.js version 8. ##### Clone the repo ``` git clone https://github.com/morten-krogh/writeurl.git ``` ##### Install the node js modules ``` npm install ``` ##### Build the browser code Go to the writeurl directory. Use the build script. ``` bash build.sh browser ``` Now the browser code is available in the directory `build/release/browser/` ##### Configuring the server The node.js server code is located in the directory `server-nodejs-express` The server needs a configuration file in the YAML format. An example file is ```server-nodejs-express/config.yaml``` ``` port: 9000 release: public: /Users/mkrogh/writeurl/build/release/browser debug: host: debug.writeurl.localhost public: /Users/mkrogh/writeurl/build/debug/browser documents: path: /Users/mkrogh/writeurl-test-dir/doc_dir publish: public: /Users/mkrogh/writeurl-test-dir/publish_dir # Pino logger # Output goes to stdout. logger: # levels: silent, fatal, error, warn, info, debug, trace level: trace ``` `port` is the port at which the server listens. `release` and `debug` are the directories built above containing the browser code. `documents` is the directory where all the writeurl documents will be stored. The server uses files to store the documents (one subdirectory per document). `publish` is the directory where the published (html) versions of the documents will be stored. `logger.level` is the logging level. Logging goes to standard output. ##### Starting the server In the directory `server-nodejs-express` type ```node writeurl-server.js config.yaml ``` ##### Start typing Go to localhost:9000 in the browser and start typing. ### Example production installation For production, it is recommended to use a reverse proxy with TLS, and to daemonize the Writeurl server. For daemonization, one can use a node.js process manager or a system daemon such as systemd on Linux. The online Writeurl service uses nginx as a reverse proxy and systemd under Linux for daemonization. ##### Example nginx configuration An example nginx.conf file is located at https://github.com/morten-krogh/writeurl/blob/master/documentation/nginx.conf ##### Example systemd unit file ``` [Unit] Description = writeurl server After = network.target [Service] Type = simple User = www ExecStart = /home/www/.nvm/versions/node/v8.9.4/bin/node /home/www/writeurl/server-nodejs-express/writeurl-server.js /home/www/writeurl/server-nodejs-express/config-debian.yaml Restart = on-failure [Install] WantedBy = multi-user.target ``` ### Backup The server can be backed up by just backing up the files in the `documents` and `publish` directories specified in the config.yaml file. Any type of file backup can be used, e.g. periodic rsync. The backup script can be used while the server is running as long as the backup script does not change any files. The server can be restarted from a backup by just placing the backup directories in the place pointed to by `documents` and `publish` in the config file. ### Embedding Writeurl can be embedded as described in https://github.com/morten-krogh/writeurl/blob/master/html/embed/index.html This page is available on the online service as well https://www.writeurl.com/embed ### Contributions and issues Bugs and feature requests are appreciated and can be opened as Github issues. We also welcome code contributions as pull requests.

Python is an object oriented high level programming language. One of the simplest programming languages of all, and also the most used language for creating System Security programs. It is Simple, yet the most powerful programming language which is very close to the Machine Language. If you have never programmed before, but you have little knowledge of how a computer works, then this the right place to start. After learning this course, one can start to build their own System programs, and also basic malware testing programs. This course is for those who want to learn how to program in python. It is intended to suit a wide audience, though not for absolute beginners. This course is targeted towards people who already have basic in either python or any other programming language. This course takes in consideration that you already know what loops, conditions, statements and variables are. This course will take you through the following chapters: Abstraction I and II, Exceptions in programs, Methods, properties and iterators, Standard Libraries and Python programming with Files. This will complete your intermediate training in Python Programming and how data structures are created and implemented in software’s. If you already know python, but other versions earlier than Python3.0, then you can start with this course to upgrade yourself with necessary modules. Some of the material in this course may be a bit difficult for an inexperienced programmer. However, once you start writing and practicing the examples in this course and writing your own codes based on these examples, then it will become quite practical for you to understand these terms. If you don’t understand some specific terms in the first bit, go through the tutorials again. Practice and Repetition are the keys to learning. This Course is in depth summary of the Core of Python. So, if you already have the basics in python, then it will be extremely easy to understand. Even if you don’t have the basics, then you can just search the specific terms used in here, understand only those and then come back to clear the advanced topics in these tutorials. This course will take you through the journey of interacting with system files using IDLE or the Python Interpreter, Creating your own servers and clients using socket programming, Understanding the database support for python with SQlite. There are also chapters which will teach you how to create your own programs which can interact with open files in any platform (UNIX, Linux, Windows or Mac). There is also a vast area covered in this course about Web Programming with Python covering the four most important topics as CGI, Screen Scraping, mod_python and Web Services. And finally there is testing, debugging and logging in Python. So, by completing this course, you will finally be able to write your own programs and test them on various platforms. The Main Idea of this course is to make the learner an advanced programmer having knowledge in bits and bytes in all various environments in Python programming. What are the requirements? Basics in Any Programming Language Basic Computer Knowledge Basics in Python such as ‘loops, variables, conditions and statements’(knowing any other language would be an added advantage) Basics in Python (knowing basic C,C++ and a bit about network programming would be an added advantage) What am I going to get from this course? Over 73 lectures and 10 hours of content! This course will clear advanced programming knowledge in Python Learn Abstraction I and II, Exceptions in programs, Methods, properties and iterators, Standard Libraries and Python programming with Files This course will take you through the journey of interacting with system files using IDLE or the Python Interpreter, Creating your own servers and clients using socket programming, Understanding the database support for python with SQlite. Learn Web Programming with Python covering the four most important topics as CGI, Screen Scraping, mod_python and Web Services Learn testing, debugging and logging in Python What is the target audience? Students Professionals Anyone who wants to learn a new Version i.e. Python 3.4.2