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#!/usr/bin/env nodevar argv = require('yargs/yargs')(process.argv.slice(2))  .usage('This is my awesome program\n\nUsage: $0 [options]')  .help('help').alias('help', 'h')  .version('version', '1.0.1').alias('version', 'V')  .options({    input: {      alias: 'i',      description: "<filename> Input file name",      requiresArg: true,      required: true    },    output: {      alias: 'o',      description: "<filename> output file name",      requiresArg: true,      required: true    }  })  .argv;
console.log('Inspecting options');console.dir(argv);
console.log("input:", argv.input);console.log("output:", argv.output);