Maintenance   
The cost to maintain ships, planes, and land units.
Mobility   
How much mobility stuff costs
Ship-types *!
Description of different types of ships.
Trade-ships * 
How to use trade ships
assault * 
Attack coastal sector from ship
board * 
Board enemy ship
build * 
Build ships, planes, land units, nuclear weapons or bridges
cargo * 
List the commodities on board your ships
coastwatch * 
Check from sectors for nearby ships
fire * 
Fire artillery from sector/ship/unit on sector/ship
fleetadd   
Designate members of a fleet
load * 
Load goods, people, etc onto a ship
lookout * 
Check from ships for other ships and/or sector types
lost * 
Report lost items
ltend   
Transfer things between a unit and the ship carrying it
mine * 
Drop sea mines from a ship
mission * 
Assign a mission to a ship/plane/unit
name   
Give a name to a ship
navigate * 
Move ship or fleet around
payoff   
Find out the current payoff of a trade ship
radar * 
Perform radar scan from ship or sector
retreat   
Set retreat conditions/paths for ships or fleets
sbmap * 
Big map of all your worldly knowledge around a ship
scrap * 
Scrap a ship, plane, or land unit
scuttle * 
Destroy a ship, plane, or unit
sdump   
Dump raw ship information
ship * 
Report status of ships
show * 
Characteristics of sectors, units, updates and more
smap * 
Get a map around a ship
sonar * 
Use sonar to look for ships
sstat * 
Report statistics of ship, fleet or ships in a given area
start   
Resume production and repairs
stop   
Stop production and repairs
tend * 
Transfer commodities between ships
torpedo * 
Slip a torpedo to some poor sucker (from a sub or ship)
unload * 
Inverse of load (above)
upgrade   
Update the tech of a ship/unit/plane to the current tech level
xdump   
Extended dump of everything under the sun
For info on a particular topic, type "info <topic>" where <topic> is one of the topics listed above. Topics marked by * are the most important and should be read by new players. Topics with unusually long info are marked with a !.