Do we have a convenient way to refer to a specific commit in an already filtered rev-list?

Hi Folks,

Do we have a convenient/symbolic way to refer  to a specific commit of
an already filtered rev-list? For example, I'm interested in the
commits with some constraints:

    git log somepath --author=someone

Without gui/tui tools, I have to frequently CUT & PASTE the commit-ID
for further manipulation (show, cherry-pick, ...), and possibly repeat
the parsing couple of times if I didn't save the output. I wonder if
we have a convenient way to refer to the discrete commits? like
HEAD~4, HEAD@{3} or something magic.

Thanks,
Roy