Become admin
Admins are listed in serveradmin.xml in the save folder (.local/share/7DaysToDie/Saves/serveradmin.xml, created on first start). Add yourself:
<admins>
<user userid="Steam_76561198000000000" name="You" permission_level="0" />
</admins>
Steam_ plus your 64-bit SteamID. Permission level 0 = everything. Save, restart (or type admin add Steam_765... 0 "You" in the console, which writes the file for you).
Commands
In-game press F1 for the console, or use the panel console (it is connected via telnet, so every command works without being in the game):
settime day,settime 14:00give <player> <item> <qty>,giveselfxp 1000teleportplayer <player> <x> <y> <z>,teleport <player>to youkick <player> <reason>,ban add <player> 1 day <reason>say "Restart in 5 minutes": chat messagelp: list players;le: list entitiessaveworld(orsa)shutdown: saves and stops
Permission levels for commands
serveradmin.xml also maps commands to levels (<permissions>), so you can let moderators kick but not give.