N98\Magento\Application::run PHP Method

    public function run(InputInterface $input = null, OutputInterface $output = null)
    {
        if (null === $input) {
            $input = new ArgvInput();
        }
        if (null === $output) {
            $output = new ConsoleOutput();
        }
        $this->_addOutputStyles($output);
        if ($output instanceof ConsoleOutput) {
            $this->_addOutputStyles($output->getErrorOutput());
        }
        $this->configureIO($input, $output);
        try {
            $this->init(array(), $input, $output);
        } catch (Exception $e) {
            $output = new ConsoleOutput();
            $this->renderException($e, $output->getErrorOutput());
        }
        $return = parent::run($input, $output);
        // Fix for no return values -> used in interactive shell to prevent error output
        if ($return === null) {
            return 0;
        }
        return $return;
    }