xwininfo

Get window info by clicking

$ xwininfo

$ xwininfo -root

$ xwininfo -id [0x12345]

$ xwininfo -name "[Window Name]"

$ xwininfo -root -tree

$ xwininfo -stats

xwininfo [-root] [-id wid] [-name name] [options]

xwininfo displays detailed information about X11 windows, including geometry (size and position), window ID, depth, visual class, and colormap. When run without arguments, it presents a crosshair cursor for interactive window selection by clicking.
Specific windows can be targeted using -id for a window ID, -name for a window title, or -root for the root window. The -tree option displays the complete window hierarchy, showing how windows are nested within each other. The tool is commonly used for debugging window managers and scripting X11 window operations.

-root

Root window.

Window ID.

Window name.

Show tree.

Statistics.

All info.

X11 only. No Wayland. Part of xorg-apps.

xwininfo is a standard X11 utility for displaying information about windows.

xprop(1), xdotool(1), xlsclients(1)