How to use the Symfony console bundle to execute commands?

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// src/Command/HelloCommand.php

namespace AppCommand;

use SymfonyComponentConsoleCommandCommand;
use SymfonyComponentConsoleInputInputInterface;
use SymfonyComponentConsoleOutputOutputInterface;

class HelloCommand extends Command
{
    protected static $defaultName = 'app:hello';

    protected function configure()
    {
        $this
            ->setDescription('Outputs a hello message')
            ->setHelp('This command outputs a hello message to the console');
    }

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

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// app/Console/Kernel.php

namespace AppConsole;

use AppCommandHelloCommand;
use SymfonyComponentConsoleCommandCommand;
use SymfonyComponentConsoleCommandLoaderCommandLoaderInterface;
use SymfonyComponentConsoleCommandLoaderContainerCommandLoader;
use SymfonyComponentConsoleInputInputInterface;
use SymfonyComponentConsoleOutputOutputInterface;
use SymfonyComponentConsoleSingleCommandApplication;
use SymfonyComponentDependencyInjectionContainerInterface;
use SymfonyComponentHttpKernelBundleBundleInterface;

class Kernel
{
    // ...

    protected function getCommandLoader(ContainerInterface $container): CommandLoaderInterface
    {
        $commands = [
            new HelloCommand(),
            // ...
        ];

        return new ContainerCommandLoader($container, $commands);
    }
}

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php bin/console app:hello