xtrace(1) on Linux
The text 5c62558c2f24, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
trace communication between X11 client and server
Flags it lists
-
--buffered -
--copyauthentication -
--denyextensions -
--interactive -
--keeprunning -
--monotonic-timestamps -
--nocopyauthentication -
--outfile -
--print-counts -
--print-offsets -
--readwritedebug -
--relative-timestamps -
--stopwhendone -
--timestamps -
--waitforclient -
-I -
-W -
-b -
-c -
-e -
-i -
-k -
-n -
-o -
-s -
-w