Sorry about today, I was shoveling

hey man

At the main menu, go to Options and toggle the developer console on. Now you'll be able to open your the console by pressing ~ (or the key above Tab).

Type sv_cheats 1 in the console. This will enable the cheats. When you get the message "sv_cvar_cheats_changed_to 1," type in the following codes for the desired effect. Note: these cheats are mainly from Left for Dead, and may not work in the sequel.
To work in sequel, you must go to console at L4D2 main menu, type in map mapname for example, map c1m1_hotel into console to use cheats, then do as normaly, sv_cheats 1, Enjoy.

tongue_range X - (Default 750) Sets the maximum range of the smoker's tongue attack
z_pounce_damage X - X is amount of damage you want to do to survivors
z_witch_burn_time - X is amount of time before a burning Witch dies from fire (does not affect damage caused by fire)
z_health - Change Zombie Health
z_speed - Change Zombie Speed
director_no_human_zombies 0/1 - Toggles controllable Boss Infected on any map
director_panic_forever 0/1 - Toggles never ending panics
director_force_panic - Forces a panic event
give ammo - Full Ammunition
give pistol - Get Pistol
impulse 101 - Spawn Ammo To Your Primary Weapon
give autoshotgun - Spawn auto shotgun
give health - Spawn full health
give gascan - Spawn gascan
give hunting_rifle - Spawn hunting rifle
give molotov - Spawn molotov
give oxygentank - Spawn oxygen tank

give pain_pills - Spawn pain pills
give pipe_bomb - Spawn pipebomb
give propanetank - Spawn propanetank
give rifle - Spawn an Mk 47 (machine gun)
give first_aid_kit - Spawn first aid kit
z_spawn weapon_SMG - Spawn the SMG
god - Invincibility
buddha 1 - just like god but you receive damage(sometimes if you are the only survivor left you can't receive damage from infected)
sb_openfire or open_fire (console will tell) - makes your bot teammates shoot nonstop
director_no_mobs <1/0> - No mob rushes
firstperson - Play in first person (default); this cheat is only necessary if thirdperson mode is enabled
Ent_Remove - Removes All Bots
z_witch_damage X - Sets the amount of damage a Witch's attack does
thirdperson_mayamode - Sets the camera to be fixed in place while in either third person or third person shoulder mode Enter once to turn on and enter again to turn off
thirdperson - Sets the camera to be in third person mode
z_common_limit - Sets the maximum amount of regular zombies

z_tank_health X - Sets the maximum health of the Tank
z_frustration_lifetime X - Sets the number of seconds until the player loses control of the Tank from not attacking survivors
sb_friendlyfire <1/0> - Toggles bot friendly fire damage
director_stop - Shuts off all wanderers, mobs, specials, and bosses
z_spawn zombie - Spawns 1 Zombie
boom - Spawns a active pipebomb under you
fire - Spawns a lighted molotov right on the floor under you
z_spawn - spawns a special infected (infected names: hunter, boomer, smoker, witch,tank, spitter, charger, jockey)
z_spawn mob - spawns a zombie horde
z_spawn boomer - Spawns boomer at location of crosshair
z_spawn hunter - Spawns hunter at location of crosshair
z_spawn smoker - Spawns smoker at location of crosshair
z_spawn tank - Spawns tank at location of crosshair
noclip - Toggles No Clipping Mode
z_witch_allow_change_victim <1/0> - True/False setting that allows the witch to change targets instead or focus on the one survivor that al