parse not own command but show --render

internal/app/wwctl/overlay/show/root.go

@@ -1,6 +1,9 @@
 package show
 
 import (
+	"log"
+
+	"github.com/hpcng/warewulf/internal/pkg/node"
 	"github.com/spf13/cobra"
 )
 
@@ -14,9 +17,24 @@ var (
 		Aliases:               []string{"cat"},
 		Args:                  cobra.ExactArgs(2),
 	}
+	NodeName string
+	Quiet    bool
 )
 
 func init() {
+	baseCmd.PersistentFlags().StringVarP(&NodeName, "name", "n", "", "node used for the variables in the template")
+	if err := baseCmd.RegisterFlagCompletionFunc("name", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+		nodeDB, _ := node.New()
+		nodes, _ := nodeDB.FindAllNodes()
+		var node_names []string
+		for _, node := range nodes {
+			node_names = append(node_names, node.Id.Get())
+		}
+		return node_names, cobra.ShellCompDirectiveNoFileComp
+	}); err != nil {
+		log.Println(err)
+	}
+	baseCmd.PersistentFlags().BoolVarP(&Quiet, "quiet", "q", false, "do not print information if multiple, backup files are written")
 }
 
 // GetRootCommand returns the root cobra.Command for the application.