Re: shell script: test for graphical session

[John Crawley <john@bunsenlabs.org>]

On 2019-10-29 22:38, Vincent Lefevre wrote:
> On 2019-10-29 14:32:39 +0900, John Crawley wrote:
> > A (bash) script wants to put up a GUI (yad) if it can, or otherwise try to
> > interact with the user on the terminal.
>> ---
> > loginctl show-session -p Type $XDG_SESSION_ID
> > and looking for 'Type=x11' or 'Type=wayland'
>> ---
> > I've replaced the test with
> > [[ -n $DISPLAY || -n $WAYLAND_DISPLAY ]] && <use GUI>
> > but environment variables are a bit fragile and I was wondering if there
> > might be a better way.
>
> Actually they seem better as you can switch the X11 display
> (or disable it) by changing the value of $DISPLAY, and the
> GUI will probably honor this choice.

Thanks everybody for the feedback!
I'll continue with the envvar test.

--
John