def METHOD_NAME(self, username, current_path, command_string):
    """
    Adds the -oX parameter to get xml output to the command string that the
    user has set.
    """
    super().METHOD_NAME(username, current_path, command_string)
    arg_match = self.xml_arg_re.match(command_string)
    if arg_match is None:
        return re.sub(r"(^.*?dnsenum(\.pl)?)", r"\1 -o %s" % self._output_file_path, command_string)
    else:
        return re.sub(arg_match.group(1), r"-o %s" % self._output_file_path, command_string)