[issue35060] subprocess output seems to depend on size of terminal screen
New submission from Edward Pratt :
I am looking for a string inside of a process, and it seems that the output of
the check_output command depends on the screen size of the terminal I run the
code in.
Here I ran the code with a normal screen resolution:
>>> result = subprocess.check_output(['ps', 'aux']).decode('ascii',
>>> errors='ignore')
>>> 'app-id' in result
False
Then I zoom out to the point where I can barely read the text on the screen,
and this is the output I get:
>>> result = subprocess.check_output(['ps', 'aux']).decode('ascii',
>>> errors='ignore')
>>> 'app-id' in result
True
--
components: Demos and Tools
messages: 328371
nosy: epsolos
priority: normal
severity: normal
status: open
title: subprocess output seems to depend on size of terminal screen
type: behavior
versions: Python 3.5
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[issue35060] subprocess output seems to depend on size of terminal screen
Edward Pratt added the comment: I don’t think that is true. I tried grepping for what I need in a very small terminal and still got the correct result. > On Oct 24, 2018, at 1:40 PM, Eryk Sun wrote: > > > Eryk Sun added the comment: > > This is due to the ps command itself. You'd have the same problem when piping > to grep or redirecting output to a file. I don't know how it determines > terminal size. I tried overriding stdin, stdout and stderr to pipes and > calling setsid() in the forked child process to detach from the controlling > terminal, but it still detected the terminal size. Anyway, the "ww" option of > ps overrides this behavior. > > -- > nosy: +eryksun > resolution: -> third party > stage: -> resolved > status: open -> closed > > ___ > Python tracker > <https://bugs.python.org/issue35060> > ___ -- ___ Python tracker <https://bugs.python.org/issue35060> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue35060] subprocess output seems to depend on size of terminal screen
Edward Pratt added the comment:
You are correct. It works as expected outside of the REPL.
> On Oct 24, 2018, at 4:34 PM, Stéphane Wirtel wrote:
>
>
> Stéphane Wirtel added the comment:
>
> My script:
>
> #!/usr/bin/env python
> import pathlib
> import subprocess
>
> output = subprocess.check_output(['ps', 'aux'])
> pathlib.Path('/tmp/ps_aux.txt').write_bytes(output)
>
>
> When I execute the following script in the REPL, I get your issue but for me,
> it's normal because the REPL is running in a terminal with a limited size.
>
> And when I execute the same script like as a simple python script, I don't
> have your issue.
>
> --
> status: closed -> open
>
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> Python tracker
> <https://bugs.python.org/issue35060>
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