diff --git a/cmd/root.go b/cmd/root.go
index fa34dce..219bb30 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -17,8 +17,6 @@ import (
 const (
 	gVersion = "0.27d"
 	
-	DEVFS_DEFAULT_RULESET = 4
-	
 	// TODO : Get from $jail_zpool/defaults.json
 	MIN_DYN_DEVFS_RULESET = 1000
 )
@@ -251,7 +249,14 @@ You can specify multiple datastores.`,
 			ListDatastores(args, true)
 		},
 	}
-
+	
+	testCmd = &cobra.Command{
+		Use:   "test",
+		Short: "temporary command to test some code snippet",
+		Run: func(cmd *cobra.Command, args []string) {
+			addDevfsRuleToRuleset("path bpf* unhide", 1999)
+		},
+	}
 )
 
 // TODO : Init log level and log output
@@ -305,6 +310,9 @@ func init() {
 	rootCmd.AddCommand(snapshotCmd)
 	rootCmd.AddCommand(migrateCmd)
 	rootCmd.AddCommand(datastoreCmd)
+	
+	rootCmd.AddCommand(testCmd)
+	
 	snapshotCmd.AddCommand(snapshotListCmd)
 	snapshotCmd.AddCommand(snapshotCreateCmd)
 	snapshotCmd.AddCommand(snapshotDeleteCmd)