xwininfo

Display information about windows. tldr-pages

On several platforms

Several platforms

Display a cursor to select a window to display its attributes (id, name, size, position, ...)

xwininfoIdentify

Display the tree of all windows

xwininfo -tree -rootIdentify

Display the attributes of a window with a specific ID

xwininfo -id window_idIdentify

Display the attributes of a window with a specific name

xwininfo -name nameIdentify

Display the ID of a window searching by name

xwininfo -tree -root | grep keyword | head -1 | perl -ne 'print $1 if /(0x[\da-f]+)/ig;'Identify