git diff between two different files

Question

In HEAD (the latest commit), I have a file named foo. In my current working tree, I renamed it to bar, and also edited it.

I want

Answer 1

I believe using --no-index is what you're looking for:

git diff [] --no-index [--]  

as mentioned in the git manual:

This form is to compare the given two paths on the filesystem. You can omit the --no-index option when running the command in a working tree controlled by Git and at least one of the paths points outside the working tree, or when running the command outside a working tree controlled by Git.