chore: add command usage error

cmd/backup.go

@@ -20,7 +20,8 @@ var BackupCmd = &cobra.Command{
 		if len(args) == 0 {
 			pkg.StartBackup(cmd)
 		} else {
-			utils.Fatal("Error, no argument required")
+			utils.Fatal(`"backup" accepts no argument %q`, args)
+
 		}
 	},
 }

cmd/migrate.go

@@ -19,7 +19,7 @@ var MigrateCmd = &cobra.Command{
 		if len(args) == 0 {
 			pkg.StartMigration(cmd)
 		} else {
-			utils.Fatal("Error, no argument required")
+			utils.Fatal(`"migrate" accepts no argument %q`, args)
 
 		}
 

cmd/restore.go

@@ -20,7 +20,7 @@ var RestoreCmd = &cobra.Command{
 		if len(args) == 0 {
 			pkg.StartRestore(cmd)
 		} else {
-			utils.Fatal("Error, no argument required")
+			utils.Fatal(`"restore" accepts no argument %q`, args)
 
 		}
 

utils/utils.go

@@ -213,3 +213,7 @@ func CronNextTime(cronExpr string) time.Time {
 	//Info("The next scheduled time is: %v\n", next)
 	return next
 }
+func UsageErrorf(cmd *cobra.Command, message string, args ...interface{}) error {
+	msg := fmt.Sprintf(message, args...)
+	return fmt.Errorf("%s\nSee '%s -h' for help and examples", msg, cmd.CommandPath())
+}