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-rw-r--r--Documentation/user-manual.txt16
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt
index 1ab3d4b87f..222171be30 100644
--- a/Documentation/user-manual.txt
+++ b/Documentation/user-manual.txt
@@ -921,6 +921,22 @@ echo "git diff --stat --summary -M v$last v$new > ../diffstat-$new"
and then he just cut-and-pastes the output commands after verifying that
they look OK.
+Finding commits referencing a file with given content
+-----------------------------------------------------
+
+Somebody hands you a copy of a file, and asks which commits modified a
+file such that it contained the given content either before or after the
+commit. You can find out with this:
+
+-------------------------------------------------
+$ git log --raw -r --abbrev=40 --pretty=oneline -- filename |
+ grep -B 1 `git hash-object filename`
+-------------------------------------------------
+
+Figuring out why this works is left as an exercise to the (advanced)
+student. The gitlink:git-log[1], gitlink:git-diff-tree[1], and
+gitlink:git-hash-object[1] man pages may prove helpful.
+
[[Developing-with-git]]
Developing with git
===================