"freeciv-server -fp savegame.sav 5555" will not work, instead you would need to enter "freeciv-server -f savegame.sav -p 5555". Most options have a short form (single hyphen and single letter) and a long form (double hyphen and a complete word); their effects are identical....
(To be completed -- Traduzione da completare) Freeciv is a client/server system. But in most cases you don't have to worry about this; the server is run automatically for you when you start a new game. So unless you're using one of the older Freeciv clie