[Gandalf Parker]

The simplest command line is
dom3 -TS
which says Text and Server mode. Since no other answers were provided it will walk you thru it asking for port number, game name, era, then it will wait for people to join. Once someone hits the start button it will number the maps that are available and ask you which one to use. The problem is that you have to stay connected. If you hang up then it will quit.

A more involved start would be
nohup dom3 -TS MyGame --port 9999 --era 1 --map aran.map -q &
which says no-hangup (keep running if I hang up)
Text mode Server
called MyGame
on port 9999
an Era 1 game
using the Aran map
the q (thats a small case Q, not a G) means quickhost whenever all the turns are in

You might also consider adding
--hours 24 along with quickhost this will host when 24 hours are up so that one player cant keep the game waiting for 4 or 5 days
--masterpass A1b2C3 the master password can help you alot when players fall out of the game so you can set them to AI
--indepstr 7 to make the game last longer
--renaming which is real popular with players

I also use --statfile --scoredump --preexec --postexec and -ddd (you probably wont want to use ddd on someone elses server since it creates a really big logfile)

Once you get used to the things its asking then you can script a game start. That way you can easily run the next game with a new name or add variables to a game