FindExistingKubeConfig returns the localtion of kubeconfig.

GetJoinCommand returns the kubeadm join command for a given token and and kubernetes cluster (the current cluster in the kubeconfig file).

SubCmdRunE returns a function that handles a case where a subcommand must be specified Without this callback, if a user runs just the command without a subcommand, or with an invalid subcommand, cobra will print usage information, but still exit cleanly.

ValidateExactArgNumber validates that the required top-level arguments are specified.

AlphaDisclaimer to be places at the end of description of commands in alpha release.

MacroCommandLongDescription provide a standard description for "macro" commands.