if !ok {
				return util.CommandParseError{
					Err: fmt.Errorf("%s not a valid option for format. See istioctl analyze --help", msgOutputFormat),
				}
			}

			if listAnalyzers {
				fmt.Print(AnalyzersAsString(analyzers.All()))
				return nil
			}

			readers, err := gatherFiles(cmd, args)
			if err != nil {
				return err
			}
			cancel := make(chan struct{})