Hello Dale! > Martin Schulte <g...@schrader-schulte.de> writes: > > I'm just wondering that bash (reproduced with 5.2-rc1 under Debian 11) > > seems to determine LINES and COLUMNS from stderr. > > It's not clear to me that the manual page says where the LINES and > COLUMNS values are obtained from.
Sorry, maybe my mail was somewhat too short... I didn't find anything in the man pages that states where these variables are obtained from. To show the behaviour do the following: - Open a (resizable) terminal window (with a bash in it), say it is /dev/pts/5 - In a second terminal window start the script #!/bin/bash shopt -s checkwinsize trap 'echo $LINES $COLUMNS' SIGWINCH while true; do sleep 0.1; done with ./winsize 2> /dev/pts/5 Whenn you now resize this window, the script will show you the size of the other one. The sources (get_new_windows_size in lib/sh/winsize.c) seem to explain well why this happens. Hope this helps to understand the problem! Best regards Martin
