code: func ValidateOutputArgs(cmd *cobra.Command) error {
  	outputMode := GetFlagString(cmd, "output")
  	if outputMode != "" && outputMode != "name" {
  		return UsageError(cmd, "Unexpected -o output mode: %v. We only support '-o name'.", outputMode)
  	}
  	return nil
  }
docs: // ValidateOutputArgs validates -o flag args for mutations