code: func (v *VTY) Command(cmd string) (string, error) {
  	if err := v.write(cmd); err != nil {
  		return "", err
  	}
  	r, s, err := v.read()
  	if err != nil {
  		return "", err
  	}
  	if s != 0 {
  		return "", VTYError{r, s}
  	}
  	return r, nil
  }
docs: // Command issues the given command over the Quagga VTY and reads the response.