From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neal Kreitzinger <nkreitzinger@gmail.com>
Subject: Re: How to find a commit that introduces (not removes) a string?
Date: Thu, 03 Nov 2011 10:56:23 -0500
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To: Sebastian Schuberth <sschuberth@gmail.com>
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On 11/3/2011 4:50 AM, Sebastian Schuberth wrote:
> Hi all,
>
> I know about git log's -S / -G, but I'm unable to make these search through *introduced* strings only. Is there a way to do so?
>
> Thanks!
>
> PS: I also read [1], but although the author claims to be interested in introduced strings only, he seems to be satisfied with -G, which slightly puzzles me.
>
> [1] http://stackoverflow.com/questions/5816134/git-finding-a-commit-that-introduced-a-string
>
If you are using linux, here is git diff command I use to find leftover 
debug statements.  I imagine the -S option will work the same in git 
log.  I pipe the results into grep to filter the results to show only 
the additions. (I'm using git 1.7.1)

$ git diff --unified=0 -S"DEBUG" <commit> <commit> -- <path> | grep -e 
"diff --" -e "+" | grep -v -e "@@" -e "+++"

maybe you will find this helpful.

v/r,
neal