index.js

#!/usr/bin/env node --harmony
var co = require('co');
var prompt = require('co-prompt');
var program =  require('commander');

program
  .arguments('<file>')
  .option('-u, --username <username>', 'The user to authenticate as')
  .option('-p, --password <password>', 'The user\'s password')
  .action(function(file) {
    co(function *() {
      var username = yield prompt('username: ');
      //var password = yield prompt.password('password: ');
      var password = yield prompt('password: ');
      console.log('user: %s pass: %s file: %s', username, password, file);
    });
  })
  .parse(process.argv);