docs: def do_ping(self, line):
          """ping [base-url ...] Check if a server responds to the DataONE ping() API
          method ping (no arguments): Ping the CN and MN that is specified in the session
          ping <base-url> [base-url ...]: Ping each CN or MN.
  
          If an incomplete base-url is provided, default CN and MN base URLs at the given
          url are pinged.
  
          """
          hosts = self._split_args(line, 0, 99, pad=False)
          self._command_processor.ping(hosts)