How can I tell whether I'm in a screen?

Question

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

Answer 1

Another way I've done it is to echo $TERM.

 $ echo $TERM
 screen

Since I end up doing this a lot, I added an alias into my .bashrc file:

alias trm='echo $TERM'

This way, whether in screen or not, if I just execute 'trm' it will show me whether I'm in SCREEN or elsewhere (usually XTERM).

Answer 2

Since all of the other methods here rely on environment variables (which can simply be overridden) or the command character for screen (which can also be overridden), the most foolproof way to check would be to list all the ancestors of the current process.

pstree --show-parents -p $$ | head -n 1 | sed 's/\(.*\)+.*/\1/' | grep screen | wc -l

If it prints 1, then the current process you're running has an ancestor with the word 'screen' in the executable's name, otherwise there wasn't.

A more facile visible inspection might be obtained from:

pstree --show-parents -p $$ | head -n 1 | sed 's/\(.*\)+.*/\1/' | less

Answer 3

My solution to the problem is a lot simpler: just hitting TAB makes the full terminal blink (a quick video inversion) if you are inside GNU Screen.

Tested working on most Linux (Ubuntu, Kali, Debian, RaspBerry... etc) and FreeBSD, GUI and any terminal, local or remote, including CtrlAltFn ones.

As an exception for this method, please, note this (rather complex, but possible) case scenario:

• 1.- SSH into computer A (lets assume Linux).
• 2.- Enter a new screen -S AScr from remote terminal on computer A.
• 3.- SSH from GNU Screen AScr terminal into Computer B.
• 4.- Enter a new screen -S BScr from remote terminal on computer B.

You are inside a Screen on cases 2 and 4, and outside a Screen on cases 1 and 3, but the terminal will blink on cases 2, 3 and 4.

Answer 4

Alternative approach to check if you are in screen.

type:

Ctrl-a ?

If you see the screen help you are in screen.

Otherwise you'll get a question mark '?' on the prompt.

Answer 5

screen -ls can tell you.

Outside screen:

$ screen -ls
There are screens on:
        16954.pts-1.auds916     (Detached)
        242.pts-8.auds916       (Detached)
2 Sockets in /tmp/screens/S-glennj.

Inside a screen:

$ screen -ls
There are screens on:
        16954.pts-1.auds916     (Attached)
        242.pts-8.auds916       (Detached)
2 Sockets in /tmp/screens/S-glennj.

Answer 6

Add one or more of the followings into your .bashrc

• alias mysession='echo ${STY}'
• alias myterm='echo ${TERM}'
• alias isscreen='if test -n "$STY"; then echo " screen session: ${STY}"; else echo " NOT a screen session"; fi'

Then you can know if you are inside a screen by typing simple commands.