Here is a current listing of server classes/perks.
This post is for Survivor class (basic player)
destroy, build and fuel lavafurnace
use lavafurnace
catacombs recall
use signlifts
/auction info
/auction bid
/warp shop (warps you to the shops)
/warp PvP (warps you to the pvp arena)
/helpop ask the OP for help
use signs
/warp spectator go to the arena
/warp spawn go right to spawn
/worth whats the item in your hand worth?
/back go to your last, non death location
/spawn go right to spawn!
/tpdeny deny a teleport request
/tpahere invite a player to tp to you
/tpaccept accept a tp request
/tpaall tp everyone?
/tpa
/sethome (you only get one)
/home takes you home
/delhome delete your home
/suicide
/rules take a peek at the rules
/msg (private message a player, also use /tell or /whisper)
/motd (read the Message of the Day, it rarely changes)
/me
/mail (including /mail read, /mail send, and /mail clear)
/list (lists players)
/itemdb (tells the item in your hand's official name and item code)
/help
/compass (what direction am I facing?)
/afk
/sell
/pay
/balancetop
/balance
/chat