These commands are for Vanilla Terraria only.

You can use these by typing them into the "Web Console" available in your control-panel, simply type in the command as listed above.

CommandDescription
helpDisplays a list of commands.
playingShows the list of players. This can be used in-game by typing /playing into the chat.
clearClear the console window.
exitShutdown the server and save.
exit-nosaveShutdown the server without saving.
saveSave the game world.
kick <player>Kicks a player from the server.
ban <player>Bans a player from the server.
passwordShow password.
password <pass>Change password.
versionPrint version number.
timeDisplay game time.
portPrint the listening port.
maxplayersPrint the max number of players.
say <words>Send a message to all players. They will see the message in yellow prefixed with <Server> in the chat.
motdPrint MOTD.
motd <words>Change MOTD.
dawnChange time to dawn (4:30 AM).
noonChange time to noon (12:00 PM).
duskChange time to dusk (7:30 PM).
midnightChange time to midnight (12:00 AM).
settleSettle all water.

You can use these by typing them into the "Web Console" available in your control-panel, simply type in the command as listed above.