Application.php
public function add(\Symfony\Component\Console\Command\Command $command)
    {
        parent::add($command);

        // Add to command list.
        $commandName = $command->getName();
        $this->commands[$commandName] = $command;
        $this->commandAliases[$commandName][] = $commandName;

        foreach ($command->getAliases() as $alias) {
            $this->commands[$alias] = $command;
            $this->commandAliases[$commandName][] = $alias;
        }

        return $command;
    }
public function add(\Symfony\Component\Console\Command\Command $command)
    {
        parent::add($command);

        // Add to command list.
        $commandName = $command->getName();
        $this->commands[$commandName] = $command;
        $this->commandAliases[$commandName][] = $commandName;

        foreach ($command->getAliases() as $alias) {
            $this->commands[$alias] = $command;
            $this->commandAliases[$commandName][] = $alias;
        }

        return $command;
    }
{@inheritdoc}