#!/usr/local/bin/node
Q = require('q');
var childProcess = require('child_process'),
  ls;


function get_the_async_data() {
    var deferred = Q.defer();

    ls = childProcess.exec('ls -l', function (error, stdout, stderr) {
      if (error) {
//        console.log(error.stack);
//        console.log('Error code: '+error.code);
//        console.log('Signal received: '+error.signal);
      }
//      console.log('Child Process STDOUT: '+stdout);
//      console.log('Child Process STDERR: '+stderr);
    });

    ls.on('exit', function (code) {
//      console.log('Child process exited with exit code '+code);
      deferred.resolve(code);
    });

    return deferred.promise;
}
get_the_async_data().then(function(code) { console.log(code) } );
//result should be '0', success!