On Friday, February 15, 2013 9:04:25 PM UTC+1, Matt Neuburg wrote:

> On Feb 15, 2013, at 9:24 AM, Bob Hiestand <bob.hi...@gmail.com<javascript:>> 
> wrote: 
> > your post didn't restrict the use to only filtering by path 
> It did; it showed an example of what I'm having to do, where I'm 
> explicitly comparing HEAD:newfile with oldCommit:oldfile. That is what I 
> need to do: compare a particular file with its version in the past. The 
> question is, is there a way to do this without my having to supply the old 
> name of the same file, every darned time. One thinks there should be, 
> because, after all, git does know the old name (as is proved by its ability 
> to log backwards through it). 
> Whenever one has to do something dumb and repetitive, a computer should be 
> doing it for you. That's what I'm asking for in this case. I have dozens of 
> these files to do these comparisons with, a lot. m. 
> PS It isn't my fault that the files were all renamed. Orders from on high, 
> don't you know.

If you are comparing many files in one diff, have a look 
at http://stackoverflow.com/questions/7759193/git-diff-renamed-file

If you want to single down to the diff on a single file, there is no first 
class way to do this in Git. You could do a feature request to the Git 
developer list <https://gist.github.com/tfnico/4441562>, and argue that it 
belongs in git diff. I agree that it would be useful, but not sure the 
developers will feel the same way.

Some GUI tools support showing the history of a single file. You can then 
select two revisions and do a compare between the two.

I guess you could script it by parsing the output of a git log with the two 
revisions and the filename in one of them, finding the old file-name, and 
then using it in a second diff call.

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