docs: def cmd_list(options):
      """Gather data for instances matching args and call display func.
  
      Args:
          options (object): contains args and data from parser.
  
      """
      (i_info, param_str) = gather_data(options)
      if i_info:
          awsc.get_all_aminames(i_info)
          param_str = "Instance List - " + param_str + "\n"
          list_instances(i_info, param_str)
      else:
          print("No instances found with parameters: {}".format(param_str))