From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: teach git diff -v/--invert-match?
Date: Fri, 22 Aug 2008 14:44:34 -0700
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Cc: Brian Ericson <bme@visi.com>, git@vger.kernel.org
To: Jeff King <peff@peff.net>
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Jeff King <peff@peff.net> writes:

> On Fri, Aug 22, 2008 at 04:29:31PM -0500, Brian Ericson wrote:
>
>> I was just working on a reply to my own email as I realized it was
>> only  dumb-luck that converted 1200 noisy changes into a couple of
>> dozen.  "-S" matches only  the string itself, not the line the string
>> resides on.  So, -Sxyz will match if  "xyz" itself was added or
>> deleted in the diff (if "xyz" is on a line that's changed but  did not
>> itself change, it won't match).  Funny that I actually knew this -- I
>> use it to look for System.out.println additions among other things.
>
> Yes (though I couldn't have told you that without experimenting -- I
> always assumed it checked whole lines).

The -Sstring counts the number of 'string' in preimage and postimage and
skips the commit if they are the same.  Nothing more.