public function __construct()
{
parent::__construct('restore', 'course');
$this->addArgument('backup_file');
$this->addArgument('category_id');
$this->addOption('d|directory', 'restore from extracted directory (1st param) under tempdir/backup');
$this->addOption('e|existing', 'restore into existing course, id provided instead of category_id');
$this->addOption('o|overwrite', 'restore into existing course, overwrite current content, id provided instead of category_id');
}