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Git diff HEAD ^ HEAD <filename> does not display anything

I am trying to show the difference between the last commit and the previous:

 git diff HEAD^ HEAD <filename>

but it doesn’t display anything. I know that there is a difference between the two commits.

What am I doing wrong and how to fix it?

PS: I feel that this has been discussed many times, but for some reason cannot find a useful link.

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2 answers

It does not display anything if this file has no changes between HEAD^ and HEAD .

Please note that with git1.8.5 + you can do:

 git diff @^ -- afile

( @ means HEAD )

git log -p -- aFile will provide all SHA1 changes for this file.
( -p to display diff)

To see the latest file modification (without having to deal with HEAD or another SHA1):

 git log -1 -p -- aFile
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The changes you made to HEAD in a particular file are obviously missing from HEAD ^, otherwise it will not be part of the commit at all.

The command to view these changes is: git show HEAD -- <filename>

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Source: https://habr.com/ru/post/1244575/

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