In case my approach is of use, for "non production" Emacs versions or instances, I change the background color of the mode-line and set the color of 'internal-border. I set a "test flag" either on version or by command-line argument "--test". The mode-line color shows fine in tty and GUI. I can't easily get confused that way.

On Thu, Oct 31, 2024 at 9:09 AM Sebastián Monía <sebastian@sebasmonia.com> wrote:

Mariano Montone <marianomontone@gmail.com> writes:

> Hello,
> what do you think of Emacs coming with an emacs-info command that
> shows current Emacs build information. I miss a command that quickly
> shows info about current Emacs.

I don't think I had a need for one, I do use 'M-x version' somewhat
regularly: I tend to run pretest or an organic, locally sourced, fair
trade version(1) and sometimes I forget which one I am using.

The 'emacs-version' command inserts the version string at point with
prefix argument. Maybe it can show this buffer with double prefix arg?
Or negative argument.

(1) which means, version I compile myself.

--
Sebastián Monía
https://site.sebasmonia.com/