How do I know I'm running inside a linux "screen" or not?

Posted by Jun Chen on Server Fault See other posts from Server Fault or by Jun Chen
Published on 2012-04-06T01:17:57Z Indexed on 2012/04/06 17:32 UTC
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gnu-screen

The "screen" refers to a program mentioned in How to reconnect to a disconnected ssh session . That is a good facility.

But there is a question I'd really like to know. How do I know whether I'm running inside a "screen"? The difference is:

If yes, I know I can safely close current terminal window, e.g., close a PuTTY window, without losing my shell(Bash etc) session.
If no, I know I have to take care of any pending works before I close the terminal window.

Better, I'd like this status to be displayed in PS1 prompt so that I can see it any time automatically.

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Developer IT

How do I know I'm running inside a linux "screen" or not? - Developer IT

How do I know I'm running inside a linux "screen" or not?

gnu-screen

Related posts about gnu-screen

GNU Screen: using VT100 ASCII codes

Ubuntu Polishes GNU Screen

Gnu screen with local scrollback buffer?

Bash vs. Gnu screen : Replace Ctrl-A with Ctrl-Shift-A

Detach current session and attach to another session, done with one script, can I?

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