proftpd(8) on Linux
The text cf3e05963bf3, as Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Professional configurable, secure file transfer protocol server
Flags it lists
-
--configtest -
--help -
--ipv4 -
--ipv6 -
--list -
--nocollision -
--nodaemon -
--quiet -
--serveraddr -
--settings -
--version -
-4 -
-6 -
-N -
-S -
-V -
-h -
-l -
-n -
-q -
-t -
-v