Previous level?

Is there a command/way for entering the previous level of a dungeon?
If yes what's the actual command for that?

I couldn't find anything in the CVARS,
you could always just changemap if you know the name of a map you're on.

is it possible for changemap -1? I'm making dinner so no testing for now.

^- I think that's pretty much right, I haven't been able to find anything of the sort either.

Changelevel2 [x] is supposed to do it, but it doesn't work, or maybe I'm just getting the parameters wrong.

EDIT: Damnit, Zealot ninja'd, my post was in reference to two posts above.