refactor: Use string-backed enums consistently

cmd/stbak/cmd/drive_root.go

@@ -6,8 +6,9 @@ import (
 )
 
 var driveCmd = &cobra.Command{
-	Use:   "drive",
-	Short: "Manage tape drives",
+	Use:     "drive",
+	Aliases: []string{"dri", "d"},
+	Short:   "Manage tape drives",
 }
 
 func init() {

cmd/stbak/cmd/inventory_root.go

@@ -6,8 +6,9 @@ import (
 )
 
 var inventoryCmd = &cobra.Command{
-	Use:   "inventory",
-	Short: "Get contents and metadata of tape or tar file from the index",
+	Use:     "inventory",
+	Aliases: []string{"inv", "i"},
+	Short:   "Get contents and metadata of tape or tar file from the index",
 }
 
 func init() {

cmd/stbak/cmd/operation_root.go

@@ -6,8 +6,9 @@ import (
 )
 
 var operationCmd = &cobra.Command{
-	Use:   "operation",
-	Short: "Perform operations on tape or tar file and the index",
+	Use:     "operation",
+	Aliases: []string{"ope", "o", "op"},
+	Short:   "Perform operations on tape or tar file and the index",
 }
 
 func init() {

cmd/stbak/cmd/recovery_root.go

@@ -6,8 +6,9 @@ import (
 )
 
 var recoveryCmd = &cobra.Command{
-	Use:   "recovery",
-	Short: "Recover tapes or tar files",
+	Use:     "recovery",
+	Aliases: []string{"rec", "r"},
+	Short:   "Recover tapes or tar files",
 }
 
 func init() {