cli.js

#!/usr/bin/env node
//chmod u+x yourscript

var express = require('express');
var prompt = require('prompt');

//cli
var fs = require('fs');
var stdin = process.stdin;
var stdout = process.stdout;
var args = process.argv.slice(2);

//receiving piped data
process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', function(data) {
  process.stdout.write(data);
});

//Signal handleing
process.on('SIGINT', () => {
  console.log('Received SIGINT.  Press Control-D to exit.');
});

//prompts
prompt.start();
prompt.get(['username', 'email'], function (err, result) {
  if (err) { return onErr(err); }
    console.log('Command-line input received:');
    console.log('  Username: ' + result.username);
    console.log('  Email: ' + result.email);
  });
  function onErr(err) {
    console.log(err);
    return 1;
  }

//exiting
function done(err) {
  console.log('exit.');
  //error handling
  if (err) {
    process.exit(1);
  } else {
    process.exit(0);
  }
}