xdm(1) on Linux
The text b6a56e02b337, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
X Display Manager with support for XDMCP, host chooser
Flags it lists
-
-config -
-debug -
-error -
-nodaemon -
-resources -
-server -
-session -
-udpPort -
-xrm