From 820923fd34cad3a069ff86e5c11ef4c2912f6e50 Mon Sep 17 00:00:00 2001
From: leafee98 <leafee98@hotmail.com>
Date: Thu, 22 Dec 2022 16:53:15 +0800
Subject: [PATCH] Show usage if parameters not sastified

---
 backup-if-change.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/backup-if-change.sh b/backup-if-change.sh
index 32a6138..e79b3f2 100755
--- a/backup-if-change.sh
+++ b/backup-if-change.sh
@@ -79,6 +79,7 @@ function main()
     if [ -z "$FILE" -o -z "$TARGET_DIR" ]
     then
         echo "option(s) --file or --target-dir is unspecified."
+        show_usage
         exit 1
     fi
     hash_prev=""