gistfile1.js

#!/usr/bin/env node

var megarepl = require('./megarepl');

// Create a new command used on every megarepl instance
megarepl.createCommand('help', 'Show this help dialog', function () {
  megarepl.output.pipe('some help info'); // pipe to the default output(process.stdout)
  return undefined;
});

// Create new megarepl instance with options
var repl = new megarepl({input: process.stdin, output: process.stdin, prompt: '>>> ', history: 'hist.log', maxHist: 500});

// Create new echo command on this repl instance
repl.createCommand('echo', 'Just echo the given arguments', function () {
  arguments.forEach(function (value) {
    repl.output.pipe(value); // Pipe to this repl output
  });

  return undefined;
});

// Manually add a new command
repl.commands['exec'] = {help: 'execute the given code', action: function (code) {
  var func = new Function(code);
  return func();
}};

repl.start(); // Start the REPL

// Close event(SIGINT, or the exit command)
repl.on('close', function () {
  repl.output.pipe('Exiting...');
  process.exit(0);
});