How to check real git diff before merging from remote branch?

Question

I want to check the real diff between remote branch and local branch. How can I do that?

Issuing the below command partially works, but it shows the diff of the new

Answer 1

From the documentation:

git diff [--options] ... [--] […]

This form is to view the changes on the branch containing and up to the second , starting at a common ancestor of both . "git diff A...B" is equivalent to "git diff $(git-merge-base A B) B". You can omit any one of , which has the same effect as using HEAD instead.

did you try this?