docs: modernize sample code

example/bool.js

@@ -1,5 +1,4 @@
 #!/usr/bin/env node
-var util = require('util');
 var argv = require('yargs/yargs')(process.argv.slice(2)).argv;
 
 if (argv.s) {

example/default_hash.js

@@ -1,5 +1,4 @@
 #!/usr/bin/env node
-
 var argv = require('yargs/yargs')(process.argv.slice(2))
     .default({ x : 10, y : 10 })
     .argv

example/divide.js

@@ -1,5 +1,4 @@
 #!/usr/bin/env node
-
 var argv = require('yargs/yargs')(process.argv.slice(2))
     .usage('Usage: $0 -x [num] -y [num]')
     .demand(['x','y'])

example/help.js

@@ -1,5 +1,4 @@
-var yargs = require('../index');
-
+#!/usr/bin/env node
 var argv = require('yargs/yargs')(process.argv.slice(2))
   .usage('This is my awesome program\n\nUsage: $0 [options]')
   .help('help').alias('help', 'h')

example/implies.js

@@ -1,5 +1,4 @@
 #!/usr/bin/env node
-
 var argv = require('yargs/yargs')(process.argv.slice(2))
     .usage('Usage: $0 -x [num] -y [num]')
     .implies('x', 'y')

example/implies_hash.js

@@ -1,5 +1,4 @@
 #!/usr/bin/env node
-
 var argv = require('yargs/yargs')(process.argv.slice(2))
     .usage('Usage: $0 -x [num] -y [num] -w [msg] -h [msg]')
     .implies({

example/requires_arg.js

@@ -1,16 +1,17 @@
+#!/usr/bin/env node
 var yargs = require('yargs/yargs')(process.argv.slice(2));
 
-var argv = yargs.usage('This is my awesome program', {
-  'input': {
+var argv = yargs.usage('This is my awesome program').options({
+  input: {
     description: 'Input file name',
     requiresArg: true,
-    short: 'i',
+    alias: 'i',
   },
-  'output': {
+  output: {
     description: 'Output file name',
     requiresArg: true,
-    short: 'o'
-  }
+    alias: 'o',
+  },
 }).argv;
 
 yargs.showHelp();

example/strict.js

@@ -1,15 +1,16 @@
+#!/usr/bin/env node
 var yargs = require('yargs/yargs')(process.argv.slice(2));
 
 var argv = yargs.usage('This is my awesome program', {
   'about': {
     description: 'Provide some details about the author of this program',
     boolean: true,
-    short: 'a',
+    alias: 'a',
   },
   'info': {
     description: 'Provide some information about this program',
     boolean: true,
-    short: 'i'
+    alias: 'i'
   }
 }).strict().argv;
 

example/usage-options.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 var yargs = require('yargs/yargs')(process.argv.slice(2));
 
 var argv = yargs.usage('This is my awesome program')