Show usage and exit non-zero for unsupported option in gvmap.sh

Towards https://gitlab.com/graphviz/graphviz/-/issues/1843.

diff --git a/cmd/gvmap/gvmap.sh b/cmd/gvmap/gvmap.sh
index 5dc7972bdd63bad0668eda8ebcbb496914cd3fd9..d78f6c40455106b2d4717dd929703ee4366cf195 100755 (executable)
--- a/cmd/gvmap/gvmap.sh
+++ b/cmd/gvmap/gvmap.sh
@@ -69,7 +69,8 @@ do
       (getopts -a gvmap "$OPTSTR" x '-?')
       exit 0
     else
-      print -u 2 "gvmap: unknown flag $OPTARG - ignored"
+      print -u 2 "gvmap: unknown flag $OPTARG"
+      getopts -a gvmap "$OPTSTR" x '-?'
     fi
     ;;
   esac