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