learnyounode/exercises/my_first_io/solution/solution.js

Learn You The Node.js For Much Win! An intro to Node.js via a set of self-guided workshops.

'use strict'
const fs = require('fs')

const contents = fs.readFileSync(process.argv[2])
const lines = contents.toString().split('\n').length - 1
console.log(lines)

// note you can avoid the .toString() by passing 'utf8' as the
// second argument to readFileSync, then you'll get a String!
//
// fs.readFileSync(process.argv[2], 'utf8').split('\n').length - 1