Merge pull request #32 from bhuvi8/master

display usage info if required args not passed

.gitignore

@@ -1,2 +1,3 @@
 .idea
 test.sh
+*~

rsync_tmbackup.sh

@@ -31,6 +31,9 @@ trap 'fn_terminate_script' SIGINT
 # -----------------------------------------------------------------------------
 # Small utility functions for reducing code duplication
 # -----------------------------------------------------------------------------
+fn_display_usage() {
+	fn_log_info "Usage : $(basename $0) <source> <[user@host:]destination> [exclude-pattern-file]"
+}
 
 fn_parse_date() {
     # Converts YYYY-MM-DD-HHMMSS to YYYY-MM-DD HH:MM:SS and then to Unix Epoch.
@@ -110,6 +113,11 @@ SSH_DEST_FOLDER=""
 SSH_CMD=""
 SSH_FOLDER_PREFIX=""
 
+#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%/}"
 EXCLUSION_FILE="$3"