Symfony konsol komutu yaratmak

namespace Application\BackendBundle\Command;

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class HelloCommand extends ContainerAwareCommand
{
    private $secret;
    private $container;

    /**
     * Definition of command
     */
    protected function configure()
    {
        $this
            ->setName('say:hello')
            ->addArgument(
                'name',
                InputArgument::REQUIRED,
                'What is the name?'
            )
            ->addArgument(
                'surname',
                InputArgument::OPTIONAL,
                'What is the surname?'
            )
            ->setDescription('This says hello to the person');
    }

    /**
     * This is like a __construct()
     */
    protected function initialize(InputInterface $input, OutputInterface $output)
    {
        $this->secret = $this->getContainer()->getParameter('secret');
        $this->container = $this->getContainer();
        //$this->myService = $this->getContainer()->get('my_service');
    }

    /**
     * Where actual process takes place
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $name = $input->getArgument('name');
        $surname = $input->getArgument('surname');

        $output->writeln("Hello $name $surname");
    }
}

php app/console list --no-debug
...
...
say
 say:hello             This says hello to the person
...
...

php app/console say:hello --help
Usage:
 say:hello name [surname]

Arguments:
 name                  What is the name?
 surname               What is the surname?

php app/console say:hello inanzzz
Hello inanzzz 
php app/console say:hello inanzzz surname
Hello inanzzz surname