With the new update to minecraft i couldn't get my modded server to work so im not to sure on that...
But the default server commands are:
op <player> --- Gives that player admin powers (op)
deop <player> --- Makes that player a normal user again
tp <player1> <player2> --- Teleports player 1 to player 2
give <player> <item id> <amount> --- Give that player the item selected (max of 64)
save-all --- saves the server chunks
save-off --- turns auto saving off
stop --- saves and closes the server
say <message> --- says that message to the rest of the players (Eg. CONSOLE: Hello)
Thats about all the useful ones i can think off
Item ID's
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