Cheat mode:
Start the game with the:

+set thereisacow 1337 +set developer 1 +set sv_cheats 1 +set monkeytoy 0 

command line parameter. Press ~ during game play to display the console 
window. Enter one of the following codes at the console window to activate the 
corresponding cheat function. Note: If the game responds "sv_cheats are read 
only", then type setrandom sv_cheats 1 in the console before activating the codes. 
If the game responds that "cheats are not enabled on this server" then type 
spdevmap <map name> (for example, burnville or dawnville) in the console 
before activating the codes.


Effect - Code 
Spawn indicated item - give <item name>  
Full health - give health  
Get all items - give all  
Ammunition - give ammo  
Invincibility - god 
Ignored by enemy - notarget  
No clipping mode - noclip  
Toggle debug mode - debug <0-1>  
Toggle developer mode - developer <0-1>  
Fly mode - ufo 
Teleport to a specific map node - jumptonode  
Suicide - kill 
List all cvars - cvarlist  
Dump all cvars to console - cvardump  
Reset all cvars - cvar_restart  
List all console commands - cmdlist  
List all shaders of current map - shaderlist  
List all images of current map - imagelist  
List all sounds currently used - snd_list  
List all entities currently used - entitylist  
List all currently bound keys - bindlist  
View graphics information - gfxinfo  
Save game - savegame  
Load saved game - loadgame  
Reset variable to default value - reset <variable name>  
Play a cinematic file - cinematic  
Set crosshair transparency; default is 1.0 - cg_crosshairAlpha <number> 
Set gravity value; default is 800 - g_gravity <number>  
Set HUD transparency; default is 1.0 - cg_hudAlpha <number>  
Set seconds that dead bodies remain on-screen  - ai_corpsecount <number>  
Set shellshock duration - cg_shellshock <number>  
Set skill level - g_gameSkill <number>  
Set weapon knockback power; default is 1000  - g_knockback <number> 
Show miss distance when hitting NPCs - cg_showMiss <0-1>  
Spawn indicated model - testmodel <model name>  
Toggle AI - g_ai <0-1>  
Toggle bullet debug mode - g_debugBullets <0-1>  
Toggle bullet marks - cg_marks <0-1>  
Toggle console debugging. - con_debug <0-1>  
Toggle crosshair - cg_drawCrosshair <0-1>  
Toggle ejecting shells - cg_brass <0-1>  
Toggle entity bounding boxes - g_drawEntBBoxes v  
Toggle fog - r_fog <0-1>  
Toggle framerate displae - cg_drawFPS <0-1>  
Toggle FX - fx_draw <0-1>  
Toggle FX debugging. - fx_debug <0-1>  
Toggle FX freezing - fx_freeze <0-1>  
Toggle fx. If set to 0, fx will be disabled.  - fx_enable <0-1> 
Toggle game timer - cg_drawTimer <0-1>  
Toggle hit debug mode - g_debugShowHit <0-1>  
Toggle HUD - cg_drawStatus <0-1>  
Toggle HUD and crosshair - cg_draw2D <0-1>  
Toggle letterbox format - cg_letterbox <0-1>  
Toggle NPC health display  - g_debugDamage <0 or 1>  
Toggle objects and backgrounds - r_drawWorld <0-1>  
Toggle objects and NPCs - r_drawEntities <0-1>  
Toggle player and AI movement debug mode - g_debugMove <0-1> 
Toggle player and AI movement debugging. - cl_debugMove <0-1> 
Toggle rendring - cg_noRender <0-1>  
Toggle shadows. - cg_shadows <0-1>  
Toggle spawning - g_spawnai <0-1>  
Toggle subtitles - cg_subtitles <0-1>  
Toggle third person view - cg_thirdPerson <0-1>  
Toggle vehicle debug mode - g_vehicleDebug <0-1>  
Toggle wireframe mode - r_showtris <0-1>  
Unknown - testgun 
Unknown - debug_tankall <0-1>  
Unknown - chain <0-1>  
Unknown - ai_nocriticalsections <0-1>  
Unknown - cg_skybox <0-1>  
Unknown - cg_stats <0-1>  
Unknown - cg_noPredict <0-1>  
Unknown - cg_selectPlayer  
Unknown - cg_tracerChance  
Unknown - cg_ignore <0-1>  
Unknown - cl_run <0-1>  
Unknown - cl_running <0-1>  
Unknown - dmflags <0-1>  
Unknown - g_changelevel_time  

Map names:
Play indicated map - map <map name>  

Map names:
airfield
berlin
brecourt
burnville
carride
chateau
dam
dawnville
factory
hurtgen
pathfinder
pavlov
pegasusday
pegasusnight
powcamp
railyard
redsquare
rocket
sewer
ship
stalingrad
tankdrivecountry
tankdrivetown
trainstation
training
truckride 


Demo version cheats
Start the game with the +set monkeytoy 0 +set sv_cheats 1 command line 
parameter. Press ~ during game play to display the console window. Enter one of 
the following codes at the console window to activate the corresponding cheat 
function. Note: If the game responds "sv_cheats are read only", then type 
setrandom sv_cheats 1 in the console before activating the codes.

Effect - Code 
Spawn indicated item - give <item name>  
Full health - give health  
Invincibility - god 
Ignored by enemy - notarget  
No clipping mode - noclip