Mark filename flags for completions

pkg/kubectl/cmd/util/printing.go

@@ -37,6 +37,7 @@ func AddPrinterFlags(cmd *cobra.Command) {
 	// template shorthand -t is deprecated to support -t for --tty
 	// TODO: remove template flag shorthand -t
 	cmd.Flags().StringP("template", "t", "", "Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview].")
+	cmd.MarkFlagFilename("template")
 	cmd.Flags().MarkShorthandDeprecated("template", "please use --template instead")
 	cmd.Flags().String("sort-by", "", "If non-empty, sort list types using this field specification.  The field specification is expressed as a JSONPath expression (e.g. '{.metadata.name}'). The field in the API resource specified by this JSONPath expression must be an integer or a string.")
 	cmd.Flags().BoolP("show-all", "a", false, "When printing, show all resources (default hide terminated pods.)")