From 18258ad2a9eaf8b958978b8ec8a39b6b99032388 Mon Sep 17 00:00:00 2001
From: Bhuvanesh Kumar <bhuvibhuvanesh@gmail.com>
Date: Wed, 29 Jan 2014 00:18:38 +0530
Subject: [PATCH] display usage info if required args not passed

---
 rsync_tmbackup.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rsync_tmbackup.sh b/rsync_tmbackup.sh
index e5192bd..2e83f5a 100755
--- a/rsync_tmbackup.sh
+++ b/rsync_tmbackup.sh
@@ -24,6 +24,9 @@ trap 'fn_terminate_script' SIGINT
 # -----------------------------------------------------------------------------
 # Small utility functions for reducing code duplication
 # -----------------------------------------------------------------------------
+fn_display_usage() {
+	fn_log_info "Usage : $(basename $0) <source> <destination> [exclude-pattern file]"
+}
 
 fn_parse_date() {
 	# Converts YYYY-MM-DD-HHMMSS to YYYY-MM-DD HH:MM:SS and then to Unix Epoch.
@@ -53,6 +56,11 @@ fn_expire_backup() {
 # -----------------------------------------------------------------------------
 # Source and destination information
 # -----------------------------------------------------------------------------
+#display usage information if required arguments are not passed
+if [[ "${#@}" -lt 2 ]]; then
+	fn_display_usage
+	exit 1
+fi
 
 SRC_FOLDER="${1%/}"
 DEST_FOLDER="${2%/}"