'git diff': Show only diff for files that exist in both commits

Question

Is there a way to use git diff to get a diff between two commits, but only show the diff for the files that exist in both commits?

I have a branch I created

Answer 1

The following may do what you want:

git diff --diff-filter=M commitA commitB

The M option to --diff-filter says only to include files that appear to be modified between the two commits - ones that only exist in one branch or the other would be selected with A ("added") or D ("deleted").

You can see which files would be selected with these letter codes by doing:

git diff --name-status commitA commitB

... and there's more information about all of that in the git diff documentation.