How to make “git diff” output normal diff format (non-unified, non-context)?

Question

I want git diff to output normal, plain old diff output (not unified diff, and not context diff).

I want this:

$ diff file1 file2
2c2
&l         


        

Answer 1

git difftool --extcmd=diff

or, without prompting:

git difftool --extcmd=diff --no-prompt

This is git difftool rather than git diff but it is doing what I want.