[vrijesh]

Cheat mode:
During game play press ~ (tilde) to display the console window, then enter the following codes.
Note: For use with the give command, weapons are limited to 1 for the number value, whereas ammunition is limited to 200 (e.g. give rifleammo 200)

Here's the list of possible item names:
machete
colt45
machinegun
rifle
bazooka
greasegun
backpack
grenade
landmine
flamethrower
gasoline
colt45ammo
machinegunammo
rifleammo
greasegunammo
bazookaammo

Result - Code:
All weapons - gimme
No clipping mode - noclip
Spawns indicated item and number - give [item name] [number]