filter-branch: add an example how to add ACKs to a range of commits

When you have to add certain lines like ACKs (or for that matter,
Signed-off-by:s) to a range of commits starting with HEAD, you might
be tempted to use 'git rebase -i -10', but that is a waste of your
time.

It is better to use 'git filter-branch' with an appropriate message
filter, and this commit adds an example how to do so to
filter-branch's man page.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index ab527b5b31..32ea8564a5 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -305,6 +305,16 @@ range in addition to the new branch name.  The new branch name will
 point to the top-most revision that a 'git-rev-list' of this range
 will print.
 
+If you need to add 'Acked-by' lines to, say, the last 10 commits (none
+of which is a merge), use this command:
+
+--------------------------------------------------------
+git filter-branch --msg-filter '
+	cat &&
+	echo "Acked-by: Bugs Bunny <bunny@bugzilla.org>"
+' HEAD~10..HEAD
+--------------------------------------------------------
+
 *NOTE* the changes introduced by the commits, and which are not reverted
 by subsequent commits, will still be in the rewritten branch. If you want
 to throw out _changes_ together with the commits, you should use the