protected function grabkey($key)
    {
        if (CommonFunctions::executeProgram('sysctl', $key, $s, PSI_DEBUG)) {
            $s = preg_replace('/'.$key.': /', '', $s);
            $s = preg_replace('/'.$key.' = /', '', $s);

            return $s;
        } else {
            return '';
        }
    }