simple usage of exec in node js

code-snippet.js

// http://nodejs.org/api.html#_child_processes
//Sample1
var sys = require('sys')
var exec = require('child_process').exec;
var child;
// executes `pwd`
child = exec("pwd", function (error, stdout, stderr) {

  sys.print('stdout: ' + stdout);

  sys.print('stderr: ' + stderr);

  if (error !== null) {

    console.log('exec error: ' + error);

  }

});

//Sample2
var sys = require('sys')
var exec = require('child_process').exec;

function puts(error, stdout, stderr) { sys.puts(stdout) }

exec("ls -la", puts);