An example to synchronously read from the command line.

readline.js

var child_process = require('child_process');
var fs = require('fs');

process.stdout.pause();
var fd = child_process.execFile('/bin/sh', ["-c", "read LINE < /dev/tty; echo $LINE > stdout; echo 1 > done"]);

while (true) {
  try {
    if (fs.readFileSync('done', {encoding: 'utf8'}).trim() === '1') { break; }
  } catch (e) {}
}

console.log(fs.readFileSync('stdout', {encoding: 'utf8'}).trim());

fs.unlinkSync('stdout');
fs.unlinkSync('done');