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diff --git a/git-grep.sh b/git-grep.sh
index 51924fd7c38a4fd70f59069a3eecbfe787626375..44c16130bd93fea8b6f172f1614115801f8df2d9 100755 (executable)
--- a/git-grep.sh
+++ b/git-grep.sh
@@ -39,5 +39,9 @@ while : ; do
        esac
        shift
 done
+[ "$pattern" ] || {
+       echo >&2 "usage: 'git grep <pattern> [pathspec*]'"
+       exit 1
+}
 git-ls-files -z "${git_flags[@]}" "$@" |
-       xargs -0 grep "${flags[@]}" "$pattern"
+       xargs -0 grep "${flags[@]}" -e "$pattern"