Small fixes

main.sh

@@ -3,7 +3,7 @@
 # entrypoint for all actions
 #
 
-VER="2.1.2"
+VER="2.1.3"
 
 HERE=$(dirname "$0")
 THIS_SCRIPT=$0
@@ -83,7 +83,9 @@ while :; do
             if [ "$2" ]; then
                 list_archive_content "$2"
             else
-                echo 'ERROR: "--content" requires a non-empty option argument.'
+                echo 'ERROR: "--content" requires the archive name as an argument.'
+                echo
+                show_help
             fi
             break
             ;;
@@ -93,7 +95,9 @@ while :; do
                 shift 2
                 restore "$archive" "$@"
             else
-                echo 'ERROR: "--restore" requires a non-empty option argument.'
+                echo 'ERROR: "--restore" requires a least the archive name as an argument.'
+                echo
+                show_help
             fi
             break
             ;;