code: protected function getFile() {
  		$file = ($this->params['dev'] ? $this->seedDevFile : $this->seedFile);
  		if (!empty($this->params['file'])) {
  			$file = $this->params['file'];
  		}
  
  		return $file;
  	}
docs: Determines which file will be executed.
  
  The default file is `config/seed.php`. When the `--dev` flag is
  present, the default file changes to `config/seed_dev.php`. If
  the `--file` option is present, it overrides everything else and
  its value is used explicitly.
  
  @return string The partial filename (from the /config dir) to execute.