xtrace(1) on Linux
The text 067f555cad5d, as Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
trace communication between X11 client and server
Flags it lists
-
--buffered -
--copyauthentication -
--denyextensions -
--interactive -
--keeprunning -
--nocopyauthentication -
--outfile -
--readwritedebug -
--stopwhendone -
-b -
-c -
-e -
-i -
-k -
-n -
-o -
-s -
-w