describe: when failing, tell the user about options that work

diff --git a/templates/hooks--prepare-commit-msg.sample b/templates/hooks--prepare-commit-msg.sample
index aa42acfd68dcb04634d1e7309b00b6e85d9933e2..365242499dcf0ee35c26ccb2917724d6e559be69 100755 (executable)
--- a/templates/hooks--prepare-commit-msg.sample
+++ b/templates/hooks--prepare-commit-msg.sample
@@ -22,10 +22,10 @@
 
 case "$2,$3" in
   merge,)
-    perl -i -ne 's/^/# /, s/^# #/#/ if /^Conflicts/ .. /#/; print' "$1" ;;
+    perl -i.bak -ne 's/^/# /, s/^# #/#/ if /^Conflicts/ .. /#/; print' "$1" ;;
 
 # ,|template,)
-#   perl -i -pe '
+#   perl -i.bak -pe '
 #      print "\n" . `git diff --cached --name-status -r`
 #       if /^#/ && $first++ == 0' "$1" ;;