Re: question .. did u implent when checkwinsize no need to exteral bin to update

[Kerin Millar]

On Sun, 23 Apr 2023 15:01:25 -0400
Grisha Levit <grishalevit@gmail.com> wrote:

> On Sun, Apr 23, 2023, 11:56 alex xmb ratchev <fxmbsw7@gmail.com> wrote:
> 
> > hmm , thank you
> > i go the /bin/true way then
> >
> 
> You can also use (:) to save an exec.

This is not case because : is a builtin. For COLUMNS and LINES to be set, 
either the command must be external or the shell must be interactive and must 
have received SIGWINCH.

$ bash -c 'declare -p COLUMNS LINES; :; declare -p COLUMNS LINES'
bash: line 1: declare: COLUMNS: not found
bash: line 1: declare: LINES: not found
bash: line 1: declare: COLUMNS: not found
bash: line 1: declare: LINES: not found

$ bash -c 'declare -p COLUMNS LINES; /bin/true; declare -p COLUMNS LINES'
bash: line 1: declare: COLUMNS: not found
bash: line 1: declare: LINES: not found
declare -- COLUMNS="80"
declare -- LINES="25"

-- 
Kerin Millar