code: func printUsageGetExitCode(s string, e int) int {
  	if len(s) > 0 {
  		fmt.Printf(s)
  	}
  	fmt.Printf(getAppUsageString())
  	return e
  }
docs: ////////////////////////////////////////////////////////////////////////////////
  // Helper function to dump the usage and print an error if specified,
  // it also returns the exit code requested to the function (saves me a line).