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// a fairly complex CLI defined using the yargs 3.0 API:var argv = require('yargs/yargs')(process.argv.slice(2))  .usage('Usage: $0 <cmd> [options]') // usage string of application.  .command('install', 'install a package (name@version)') // describe commands available.  .command('publish', 'publish the package inside the current working directory')  .option('f', { // document options.    array: true, // even single values will be wrapped in [].    description: 'an array of files',    default: 'test.js',    alias: 'file'  })  .alias('f', 'fil')  .option('h', {    alias: 'help',    description: 'display help message'  })  .string(['user', 'pass'])  .implies('user', 'pass') // if 'user' is set 'pass' must be set.  .help('help')  .demand('q') // fail if 'q' not provided.  .version('1.0.1', 'version', 'display version information') // the version string.  .alias('version', 'v')  // show examples of application in action.  .example('npm install npm@latest -g', 'install the latest version of npm')  // final message to display when successful.  .epilog('for more information visit https://github.com/chevex/yargs')  // disable showing help on failures, provide a final message  // to display for errors.  .showHelpOnFail(false, 'whoops, something went wrong! run with --help')  .argv;
// the parsed data is stored in argv.console.log(argv);