code: func GetExitCode(err error) (int, error) {
  	exitCode := 0
  	if exiterr, ok := err.(*exec.ExitError); ok {
  		if procExit, ok := exiterr.Sys().(syscall.WaitStatus); ok {
  			return procExit.ExitStatus(), nil
  		}
  	}
  	return exitCode, fmt.Errorf("failed to get exit code")
  }
docs: // GetExitCode returns the ExitStatus of the specified error if its type is
  // exec.ExitError, returns 0 and an error otherwise.