The very first line in the output of a pull looks like this:
$ git pull
Updating 37b431a..b2615b4
So to get the diff between before and after pull request, use -->
$ git diff 37b431a..b2615b4
git log --name-status -2
# Will show you the names of the files that changed for the last two commits.
git log -p -2
# Will show you the changes themselves.
## =================================
## Before you pull,
git fetch
git log --name-status origin/master..
# Will show you what commits you are about to retrieve, along with the names of the files.
.