On Sun, 2015-09-13 at 11:32 -0700, Michael wrote:
> I've got a file, with a diff/change, that I thought had already been
> checked into a previous commit. I want to see if this change exists in
> any checkin of that file.
> Is there any way to ask for "all the checked-in versions of file X"?
> As far as I know, git only knows files by their sha hashes, and not by
> names -- which already tells me that there's probably something that I
> really don't understand about git.

Git doesn't know files by SHA hashes.  Git knows "a set of changes to
one or more files" by its SHA hash.  The SHA hash names the _commit_ not
a specific file.

However, if you want to see the commits that impacted a given file it's

  git log <filename>

If you want to see the commits that impacted any file in a subdirectory
that's trivial as well:

  git log <dirname>

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