CODEWITHSUNDEEP
pythonsubprocessstdout
Bananach
Bananach

Reputation: 2311

Completely capture output of call to GNU screen

In a Python 3 program of mine, I open a GNU screen session at some point. Upon closing this session, the output 

[screen is terminating]

is printed to the surrounding session (the terminal in which the python program is run). How do I prevent this?

I am currently running something like 

import subprocess 
subprocess.run('screen',stdout=subprocess.PIPE,stderr=subprocess.PIPE)

Usually, the [stdout,stderr]=subprocess.PIPE captures the output and err (e.g. for run('echo hello',stdout=subprocess.PIPE) nothing is printed) but for some reason this doesn't work with screen

Upvotes: 0

Views: 252

Answers (1)

Leo K
Leo K

Reputation: 5354

You should capture stderr as well as stdout, if you don't want anything printed on the console.

Screen may also be detecting that stdin is a tty and using that for I/O. I don't know if giving it a pipe or /dev/null will solve the problem, though. Try it and see if it works.

Screen most likely needs access to a tty device to work. You could create a tty for it (by opening /dev/ptmx and giving screen the corresponding /dev/pts/N file), but that's by no means trivial.

Upvotes: 2

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