Symfony2 Call Service from Command

You can also use extend the ContainerAwareCommand:

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;

class FooCommand extends ContainerAwareCommand
{
    // ...
}

Then you can use:

$this->get('service);

Into Symfony 2.3.7
$em = $this->getContainer()->get('doctrine.orm.entity_manager');

You can also just decouple your commands from Symfony and use them as services, then you can do a regular dependecy injection to the constructor of the command.