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#!/usr/bin/env nodevar argv = require('yargs/yargs')(process.argv.slice(2))    .usage('Count the lines in a file.\nUsage: $0')    .wrap(80)    .demand('f')    .alias('f', [ 'file', 'filename' ])    .describe('f',        "Load a file. It's pretty important."        + " Required even. So you'd better specify it."    )    .alias('b', 'base')    .describe('b', 'Numeric base to display the number of lines in')    .default('b', 10)    .describe('x', 'Super-secret optional parameter which is secret')    .default('x', '')    .argv;
var fs = require('fs');var s = fs.createReadStream(argv.file);
var lines = 0;s.on('data', function (buf) {    lines += buf.toString().match(/\n/g).length;});
s.on('end', function () {    console.log(lines.toString(argv.base));});