Jquery Button OnClick Run System Command

Question

Can anyone provide a simple example of running a system command in the background when a button is clicked.

eg: when this is clicked:

<button onclick="startprocess">Start</button>

run

$var = system('tail -f /mail.log > /download/mail.log 2>&1 & echo $!');

Thanks

Answer 1

html :

<button id="run_system">Start</button>

js :

$('#run_system').on('click', function() {
    $.ajax({
        url : 'run.php'
    }).done(function(data) {
        console.log(data);
    });
});

run.php :

<?php
    echo shell_exec('tail -f /mail.log > /download/mail.log 2>&1 & echo $!');
?>