xwininfo

TLDR

Get window info by clicking

$ xwininfo

Get root window info

$ xwininfo -root

Get by window ID

$ xwininfo -id [0x12345]

Get by name

$ xwininfo -name "[Window Name]"

Show tree

$ xwininfo -root -tree

Stats only

$ xwininfo -stats

SYNOPSIS

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

DESCRIPTION

xwininfo shows window info. It queries X properties.
Window geometry. Size and position.
Window ID. Identification.
Tree display. Window hierarchy.
Click to select. Interactive mode.

PARAMETERS

-root

Root window.

-id WID

Window ID.

-name NAME

Window name.

-tree

Show tree.

-stats

Statistics.

-all

All info.

CAVEATS

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

HISTORY

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