code: func GetJoinWorkerCommand(kubeConfigFile, token string, skipTokenPrint bool) (string, error) {
  	return getJoinCommand(kubeConfigFile, token, "", false, skipTokenPrint, false)
  }
docs: // GetJoinWorkerCommand returns the kubeadm join command for a given token and
  // and Kubernetes cluster (the current cluster in the kubeconfig file)