setName('config:get') ->setDescription("Gets a configuration option's value") ->addArgument( 'key', InputArgument::REQUIRED, "The configuration option's name" ) ; } protected function execute(InputInterface $input, OutputInterface $output) { $key = $input->getArgument('key'); if (isset($this->config[$key])) { $output->writeln("{$this->config[$key]}"); } else { $output->writeln("Could not get config $key"); } } }