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user-manual: finding commits referencing given file content

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Another amusing git exploration example brought up in irc.  (Credit to
aeruder for the complete solution.)

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
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J. Bruce Fields 2007-05-19 00:37:25 -04:00
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Documentation/user-manual.txt
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@ -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
===================