public function commandFlags(CommandInterface $cmd, $cmdSignature)
    {
        $args = [];
        $specs = $cmd->getOptionCollection();
        /*
        '(- 1 *)--version[display version and copyright information]' \
        '(- 1 *)--help[print a short help statement]' \
        */
        foreach ($specs->options as $opt) {
            $args[] = $this->optionFlagItem($opt, $cmdSignature);
        }

        return empty($args) ? null : $args;
    }