deal with unknown option

varbackup

@@ -25,6 +25,10 @@ while getopts ":hsv" option; do
       v) # enable verbose mode
          verboseOption=" -v"
          ;;
+      "?")
+         echo -e "\e[31mUnknown option -$OPTARG\e[0m"
+         exit 1
+         ;;
    esac
 done