git diff file against its last change

Question

Is it possible to get git to produce a diff between a specific file as it exists now, and as it existed before the last commit that changed it?

That is, if we know:

Answer 1

One of the ways to use git diff is:

git diff  

And a common way to refer one commit of the last commit is as a relative path to the actual HEAD. You can reference previous commits as HEAD^ (in your example this will be 123abc) or HEAD^^ (456def in your example), etc ...

So the answer to your question is:

git diff HEAD^^ myfile