Question from the Node.js test

cp.exec('ls', ['-l'], function (err, stdout, stderr) { console.log(stdout); });

cp.exec('ls -l', function (err, stdout, stderr) { console.log(stdout); });

cp.spawn('ls', ['-l']).stdout.on('data', function(data) { console.log(data.toString()); });

cp.spawn('ls -l']).stdout.on('data', function(data) { console.log(data.toString()); });