Add option -? for usage to vimdot

diff --git a/plugin/xlib/vimdot.sh b/plugin/xlib/vimdot.sh
index a8d25b5b21eb4bfb8f42d557ea1d9d1a5c834c71..1ca125954e1671ec4d74a7fa5468c98c6ba54f4a 100755 (executable)
--- a/plugin/xlib/vimdot.sh
+++ b/plugin/xlib/vimdot.sh
@@ -1,6 +1,11 @@
 #!/bin/sh
 # Written by: John Ellson <ellson@research.att.com>
 
+if [ "$1" = "-?" ]; then
+    echo "Usage: vimdot [file]" >&2
+    exit 0
+fi
+
 error() { echo "$0: $*" >&2; exit 1; }
 
 # Try $EDITOR first, else try vim or vi