Add help option

scripts/backstep-traceback-auto

@@ -17,13 +17,28 @@
 
 #set -e -x
 
+function show_help {
+	cat <<-EOF
+	$0 [-hv] [-o lv-name] [daily|weekly]
+
+	-h	Show this help.
+	-v	Show verbose debug information & set debug options.
+	-o	Only do a backup of the specified lv.
+
+EOF
+}
+
 export PATH="$PATH:/sbin:/usr/sbin"
 
 # Parse options
 OPTIND=1
-while getopts ":o:v" OPTION
+while getopts ":ho:v" OPTION
 do
 	case "$OPTION" in
+		h)
+			show_help
+			exit 0
+		;;
 		o)
 			ONLY="$OPTARG"
 		;;