How to know the types of windowing system, window manager and desktop environment of a Unix-like OS Code Answer

I was wondering what commands/utilities can be used in terminal to know the types of windowing system (such as X window system), window manager (such as Metacity, KWin, Window Maker) and desktop environment (such as KDE, Gnome) of a Linux or other Unix-like operating systems?



From Ask Ubuntu.SE: If you have wmctrl installed, wmctrl -m will identify the window manager for you.

Thomas already mentioned the XDG_CURRENT_DESKTOP environment variable for identifying the desktop environment.

And from this thread here in Unix & Linux SE: the XDG_SESSION_TYPE environment variable can be used to identify whether the windowing system is X11 or Wayland.

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