xwininfo(1) on Linux
The text 259c6b5a7534, as Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
window information utility for X
Flags it lists
-
-all -
-bits -
-children -
-display -
-english -
-events -
-frame -
-help -
-id -
-int -
-metric -
-name -
-root -
-shape -
-size -
-stats -
-tree -
-wm