When using screen in linux, how can I tell if I'm in a screen or not?
I could do exit and I'll exit a screen if I was in one, but if I wasn't, then I'll end up closing my terminal.
When doing screen -r, I could see if I have other screens attached, but how do I know if my current terminal is one of those attached screens?
Check $STY. If it's null, you're on a "real" terminal. If it contains anything, it's the name of the screen you're in.
If you are not in screen:
eric@dev ~ $ echo $STY
eric@dev ~ $
If you are in screen:
eric@dev ~ $ echo $STY
2026.pts-0.ip-10-0-1-71