N98\Magento\Command\OpenBrowserCommand::resolveOpenerCommand PHP Method

    private function resolveOpenerCommand(OutputInterface $output)
    {
        $opener = '';
        if (OperatingSystem::isMacOs()) {
            $opener = 'open';
        } elseif (OperatingSystem::isWindows()) {
            $opener = 'start';
        } else {
            // Linux
            if (exec('which xdg-open')) {
                $opener = 'xdg-open';
            } elseif (exec('which gnome-open')) {
                $opener = 'gnome-open';
            } elseif (exec('which kde-open')) {
                $opener = 'kde-open';
            }
        }
        if (empty($opener)) {
            throw new RuntimeException('No opener command like xdg-open, gnome-open, kde-open was found.');
        }
        if (OutputInterface::VERBOSITY_DEBUG <= $output->getVerbosity()) {
            $message = sprintf('open command is "%s"', $opener);
            $output->writeln('<debug>' . $message . '</debug>');
        }
        return $opener;
    }