docs: def do_save(self, line):
          """save [config_file] Save session variables to file save (without parameters):
          Save session to default file ~/.dataone_cli.conf save.
  
          <file>: Save session to specified file.
  
          """
          config_file = self._split_args(line, 0, 1)[0]
          self._command_processor.get_session().save(config_file)
          if config_file is None:
              config_file = (
                  self._command_processor.get_session().get_default_pickle_file_path()
              )
          self._print_info_if_verbose("Saved session to file: {}".format(config_file))