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git diff HEAD^ HEAD displays nothing

It would display nothing if that particular file had no changes between HEAD^ and HEAD.

Note that with git1.8.5+, you can do a:

git diff @^ -- afile

(@ means HEAD)

git log -p -- aFile would give all the SHA1 were a change for that file occurred.
(-p for displaying the diff)

To see the last modification on a file (without having to deal with HEAD or other SHA1):

git log -1 -p -- aFile

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