systemd-socket-activate(1) on Linux
The text 4bb01c74e9ea, as Debian 10 (Buster) shipped it.
Test socket activation of daemons
Flags it lists
-
--accept -
--datagram -
--fdname -
--help -
--inetd -
--listen -
--seqpacket -
--setenv -
--version -
-E -
-a -
-d -
-h -
-l