How to execute a command within a controller of a Symfony2 application and print in real-time the output in a Twig template

If you need lo launch a simple shell script and capture the output, you can use a StreamedResponse in conjunction with the Process callback you posted.

As Example, suppose you have a very simple bash script like follow:

loop.sh

for i in {1..500}do   echo "Welcome $i times"done

You can implement your action like:

/** * @Route("/process", name="_processaction") */public function processAction(){    // If your script take a very long time:    // set_time_limit(0);    $script='/path-script/.../loop.sh';    $process = new Process($script);    $response->setCallback(function() use ($process) {        $process->run(function ($type, $buffer) {            if (Process::ERR === $type) {                echo 'ERR > '.$buffer;            } else {                echo 'OUT > '.$buffer;                echo '<br>';            }        });    });    $response->setStatusCode(200);    return $response;}

And depends on the buffer length you can have an output like:

.....OUT > Welcome 40 times Welcome 41 times OUT > Welcome 42 times Welcome 43 times OUT > Welcome 44 times Welcome 45 times OUT > Welcome 46 times Welcome 47 times OUT > Welcome 48 times OUT > Welcome 49 times Welcome 50 times OUT > Welcome 51 times Welcome 52 times OUT > Welcome 53 times .....

You can wrap this in a portion of a page with a render controller as example:

<div id="process">    {{ render(controller(        'AcmeDemoBundle:Test:processAction'    )) }}</div>

More info here

Hope this help