CompareNamespace returns an error if the namespace the user has provided on the CLI or via the default namespace file does not match the namespace of an input file.

Assumes the flag has a default value.

OutputVersion returns the preferred output version for generic content (JSON, YAML, or templates).

PrinterForCommand returns the default printer for this command.

ReadConfigData reads the bytes from the specified filesytem or network location or from stdin if location == "-".

TODO: replace with resource.Builder.

ResourceFromArgs expects two arguments with a given type, and extracts the fields necessary to uniquely locate a resource.

ResourceFromFile retrieves the name and namespace from a valid file.