public function fire()
{
$days = (int) $this->option('days');
if ($days < 0) {
$this->writeError("days option cannot be negative");
return self::ERROR;
}
$success = $this->manager->deleteBackupFiles($this->lang_folder_path, $days, $this->option('dry-run'));
return $success === true ? self::SUCCESS : self::ERROR;
}