What Changed?
If you want to know what has changed at each commit in your Git history,
then just ask git whatchanged.
This is an old command that is mostly equivalent to git-log. In fact, the
man page for git-whatchanged says:
New users are encouraged to use git-log(1) instead.
The difference is that git-whatchanged shows you the changed files in
their raw format which can be useful if you know what you are looking for.
See man git-whatchanged for more details.