How to tell whether a session is an X session or Wayland?

This is probably an easy question, but in my session manager list at login, I have the following:

      Gnome on Xorg
      Gnome
      Plasma
      Gnome

I know the Plasma is X, and I know Gnome on Xorg is X, but why are there two other entries for Gnome? And how to tell whether they are Wayland or X?

these entries are files in /etx/X11/Xsessions or some such location.
looking inside those files would reveal what is actually being started, or at least help along the way.

i thought you wanted to ask "how to find out programmatically during desktop session".
nevertheless, an interesting question.

Originally Posted by ondoho these entries are files in /etx/X11/Xsessions or some such location. looking inside those files would reveal what is actually being started, or at least help along the way. i thought you wanted to ask "how to find out programmatically during desktop session". nevertheless, an interesting question.

I do want to find out how to tell during a desktop session also. I guess I wasn't clear and went off on the login screen, but yeah, I would like to know how to tell during a desktop session.

a web search goes a long way.
this search query gives interesting results.
most suggestions didn't work for me because i startx from the command line (my session is still reported as tty), put you can always

ps aux| grep -w X

or some such.

Originally Posted by ondoho a web search goes a long way. this search query gives interesting results. most suggestions didn't work for me because i startx from the command line (my session is still reported as tty), put you can always ps aux| grep -w X or some such.

Thank you! That worked. I found a utility called inxi that works also.