CODEWITHSUNDEEP
bashshell
incrazyboyy
incrazyboyy

Reputation: 23

grep from screen output and detach

I'm currently writing a bash script which periodically checks for some special words in the server output of a detached screen session, but it enters the session (if grep found something) instead of showing the grepped output. Here is what I've tried:

screen -r foo | grep bar

This gives me the correct return code, but doesn't detach the session afterwards! I also tried && screen -d but that changes nothing. So how can my script tell me if "bar" is in the output of the server running in my "foo" screen session?

Upvotes: 2

Views: 4122

Answers (1)

miken32
miken32

Reputation: 42724

Your problem, I think, is that screen doesn't output in a way that can be searched by grep. If it did, then your attempt at screen -r foo | grep bar && screen -d would likely have been the right way to go about it.

I'd suggest starting the initial screen session with the -L option to enable logging. Then you can search the log file for the value you want.

Upvotes: 2

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