xlsclients

xlsclients [-a] [-l] [-display dpy] [options]

xlsclients lists the client applications currently connected to an X display server. For each client, it shows the window name and the command used to launch it, providing a quick overview of what X11 applications are running.The tool is useful for debugging X11 sessions, identifying which applications are consuming display resources, and verifying that expected clients are connected. The -a option shows clients across all screens, while -l provides a long format with additional detail about each client's machine name and command line.

-a

All screens.

Long format.

X display.

Max command length.

X11 only. No Wayland. Limited info shown.

xlsclients is a standard X11 utility for listing client applications connected to an X server.

xwininfo(1), xprop(1), xdotool(1)