How to read a file line by line in Node.js using the yet unstable Readline library (http://nodejs.org/api/readline.html)

line-reader.js

var fs = require("fs"),
    readline = require("readline");

var reader = readline.createInterface({
  input: fs.createReadStream("large-file.txt"),
  output: fs.createWriteStream("/dev/null"),
  terminal: false
});

reader.on("line", function(line) {
  console.log("Line:", line);
});