God God-Mode 
Fly Fly-Mode 
NoClip Lets you walk through walls 
Impulse 9 All weapons and full ammo 
Give s,c,r,n and then how many of each ( s= shells, c=cells, r=rockets, n=nails) 
Notarget Monsters will not attack unless provoked 
Map eXmX The X's is the episode and level number 
Kill Suicide 
Impulse 255 Instant Quad 
Impulse -1 Everything but the weapons. 
Impulse 11 Jewels 
Give # Give any gun (# = Gun number) 
Sv_Gravity Change Gravity 
Give Health # Health (# up to 999)