code: func Get(err error) (int, bool) {
  	err = errors.Unwrap(err)
  	if err == nil {
  		return 0, true
  	}
  
  	if ee, ok := err.(*exec.ExitError); ok {
  		return ee.Sys().(syscall.WaitStatus).ExitStatus(), true
  	}
  	return 0, false
  }
docs: // Get returns the process process exit return code given an error returned by
  // exec.Cmd's Wait or Run methods. If no exit code is present, Get will return
  // false.