MAIN CHEAT CODES

Command                 Item                  Quantity  give all                All Item              See Other Cheat Codes  give health             Healt                 100  give weapons            All Weapons           All/No Ammo  give ammo               All Ammo              100s/200b&c/50g&s&r  give armor              Body Armor            200  give body armor         Body Armor            +1  god                     God Mode              N/A (on/off)  notarget                No Target Mode        N/A (on/off)  noclip                  No Clip Mode          N/A (on/off)   

OTHER CHEAT CODES

Command                 Item                    Quantity  give jacket armor       Jacket Armor            1  give blaster            Blaster                 1 - No ammo  give shotgun            Shotgun                 1 - No ammo  give super shotgun      Super Shotgun           1 - No ammo  give machinegun         Machinegun              1 - No ammo  give chaingun           Chaingun                1 - No ammo  give grenade launcher   Grenade Launcher        1 - No ammo  give rocket launcher    Rocket Launcher         1 - No ammo  give railgun            Railgun                 1 - No ammo  give bfg10k             BigFu*kingGun10k        1 - No ammo  give shells             Shells                  10  give bullets            Bullets                 50  give cells              Cells                   50  give grenades           Grenades                5  give rockets            Rockets                 5  give slugs              Slugs                   10  give quad damage        Quad Damage             1  give invulnerability    Invulnerability         1  give silencer           Silencer                1  give rebreather         Rebreather              1  give environment suit   Environment Suit        1  give ancient head       Ancient Head            1   give adrenaline         Adrenaline              1  give bandolier          Bandolier               1  give ammo pack          Ammo Pack               1  give data cd            Data CD                 1  give power cube         Power Cube              1  give pyramid key        Pyramid Key             1  give data spinner       Data Spinner            1   

EXTRA CHEAT CODES

give airstrike marker   AirStrike Marker        1  give blue key           Blue Key                1  give red key            Red Key                 1  give security pass      Security Pass           1  give commander\'s head   Commander\'s Head        1  give power shield       Power Shield            1  give armor shard        Armor Shard             1  give combat armor       Combat Armor            1    *The above 8 commands are not activated by the "give all" command.   

OTHER STUFF

To use cheat codes in multiplayer mode, you must run the server with
the following command: +set cheats 1

I also found the following in the source code, These are not cheats
at all, but seem to be multiplayer actions or communications that
you can do to other other players in the game.

point
wave
salute
taunt
flipoff
putaway


Pete Nilson sent these too me:
wave 0 is the flipoff
wave 1 is the salute
wave 2 is the taunt
wave 3 is a wave
wave 4 is point