code: protected function doExecute(InputInterface $input, OutputInterface $output)
      {
          // Ask questions.
          if ($this->askQuestions($input, $output) == static::RETURN_ERROR) {
              return static::RETURN_ERROR;
          }
  
          // Prepare data.
          $data = $this->prepareData($input);
          // Pre-execute
          $this->doPreExecuteTasks($input, $output, $data);
          // Execute.
          $return = $this->executeTasks($input, $output, $data);
          // Post execute.
          $this->doPostExecuteTasks($input, $output, $data, $return);
  
          return $return;
      }
docs: Do Execute command.
  
  @param InputInterface $input
  Input.
  @param OutputInterface $output
  Output.
  
  @return int
  Return Code.