code: func readSystemProperty(key string) (string, error) {
  	keyPath := strings.Replace(key, ".", "/", -1)
  	value, err := ioutil.ReadFile(path.Join("/proc/sys", keyPath))
  	if err != nil {
  		return "", err
  	}
  	return strings.TrimSpace(string(value)), nil
  }
docs: // readSystemProperty reads the value from the path under /proc/sys and returns it