xcompmgr(1) on Linux
The text f4deeecc6d70, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
sample X compositing manager
Flags it lists
-
-C -
-D -
-F -
-I -
-O -
-S -
-a -
-c -
-d -
-f -
-l -
-n -
-o -
-r -
-s -
-t