Once again Tim is right on the money (a nominee for hero status).
In my shop most Oracle boxes are running on HP/UX but there are a few that are on NT, both production and developement. So NT is still used but I would start learning some Unix as well. I knew nothing about Unix when I started here, now I know next to nothing.

The vi editor is a killer, I think it was invented on Mars.

Good Luck
MH