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Re: Gettings LINES and COLUMNS from stderr instead of /dev/tty

From: Chet Ramey
Subject: Re: Gettings LINES and COLUMNS from stderr instead of /dev/tty
Date: Mon, 18 Jul 2022 10:26:05 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.10.0

On 7/16/22 11:18 AM, Martin Schulte wrote:

I'm just wondering that bash (reproduced with 5.2-rc1 under Debian 11) seems to 
determine LINES and COLUMNS from stderr.

It uses stderr because if the shell is interactive, stderr is guaranteed to
be a terminal, and that's the file descriptor it uses to perform job
control. When it's not interactive, all bets are off, and stderr is usually
a safe default. There's no consistent approach across shells.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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