Add usage statement to git-checkout.sh

Signed-off-by: Chris Shoemaker <c.shoemaker@cox.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-checkout.sh b/git-checkout.sh
index 73652fa..cb33fdc 100755 (executable)
--- a/git-checkout.sh
+++ b/git-checkout.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 . git-sh-setup || die "Not a git archive"
 
+usage () {
+    die "usage: git checkout [-f] [-b <new_branch>] [<branch>] [<paths>...]"
+}
+
 old=$(git-rev-parse HEAD)
 new=
 force=
@@ -26,6 +30,9 @@ while [ "$#" != "0" ]; do
        --)
                break
                ;;
+       -*)
+               usage
+               ;;
        *)
                if rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null)
                then