code: func StringFlagOrEnv(flagValue *string, envKey string) string {
  	if flagValue != nil && *flagValue != "" {
  		return *flagValue
  	}
  	return os.Getenv(envKey)
  }
docs: // StringFlagOrEnv - returns the value of the flag if specified, otherwise the env's value.
  // Empty string counts as not specified!