How to use the Symfony console to execute commands?

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use SymfonyComponentConsoleApplication;

$application = new Application();

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use SymfonyComponentConsoleCommandCommand;
use SymfonyComponentConsoleInputInputInterface;
use SymfonyComponentConsoleOutputOutputInterface;

class MyCommand extends Command
{
    protected function configure()
    {
        $this->setName('my:command')
             ->setDescription('My custom command');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $output->writeln('Hello world!');
    }
}

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$application->add(new MyCommand());

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$application->run();

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php console my:command