Here is a list of "cheat codes" for Counter Strike 1.6. Most of these are not really "cheats" in the true sense of the word but commands to change the preferences.

Activate the console on the server machine (~) and type "sv_cheats 1"
to enable the following codes.

NOTE: All codes must be entered from the Host computer.

Counter Strike PC Game Cheat : Arctic sniper rifle
Counter Strike PC Game Cheat Code : givespaceweapon_awp

Counter Strike PC Game Cheat : Auto-aim with sniper rifle
Counter Strike PC Game Cheat Code : sv_aim

Counter Strike PC Game Cheat : Adjust gravity
Counter Strike PC Game Cheat Code : sv_gravity (-999 - 999999)

Counter Strike PC Game Cheat : See and fire through walls and objects
Counter Strike PC Game Cheat Code : gl_zmax (0-9999)

Counter Strike PC Game Cheat : View other players' frags
Counter Strike PC Game Cheat Code : cl_hidefrags 0

Counter Strike PC Game Cheat : Faster forward motion
Counter Strike PC Game Cheat Code : cl_forwardspeed 999

Counter Strike PC Game Cheat : Faster backwards motion
Counter Strike PC Game Cheat Code : cl_backspeed 999

Counter Strike PC Game Cheat : Faster side motion
Counter Strike PC Game Cheat Code : cl_sidespeed 999

Counter Strike Cheat : Level select
Counter Strike Cheat Code : changelevel

Counter Strike Cheat : Weapon select
Counter Strike Cheat Code : give


Use one of the following entries with the 'give' code to get the corresponding weapon.
AK-47
weapon_ak47

Benneli xm1014
weapon_xm1014

C4
weapon_c4

Colt M4a1 carbine
weapon_m4a1

Commando
weapon_sg552

Fn P90
weapon_p90

Glock 18 pistol
weapon_glock18

HE grenade
weapon_hegrenade

M3 super shotgun
weapon_m3

MAC-10
weapon_mac 10

MP5
weapon_mp5navy

Para
weapon_m249

Scout
weapon_scout

SIG p228
weapon_p228

Steyr Aug
weapon_aug

Desert eagle
weapon_deagle

Usp.45 pistol
weapon_usp


Other Counter Strike 1.6 Cheat Codes

Auto-reload enabled
Counter Strike Cheat Code : +reload

Auto-reload disabled
Counter Strike Cheat Code : -reload

Change skins
Counter Strike Cheat Code : skin

Use the following skin names with 'skin' code:
Arab - arab
Arctic - arctic
GSG9 - gsg9
Guerrilla - guerrilla
Hostage - hostage
SAS - sas
SEAL - seal
Terrorist - terror
VIP - vip

See things brightly without flashlight
Counter Strike Cheat Code : lambert -1.0001

SetC4 timer
Counter Strike Cheat Code : mp_c4timer (-1000-1000)

Hyper auto-aim enabled
Counter Strike Cheat Code : sv_clienttrace 999999999

Hyper auto-aim disabled
Counter Strike Cheat Code : sv_clienttrace 1

Get $16,000
Counter Strike Cheat Code : impulse101

Splatter bones and body tissue
Counter Strike Cheat Code : impulse102 (or impulse202)

Set freeze period at the start of rounds. Set to 0 to disable (default is 6)
Counter Strike Cheat Code : mp_freezetime (#)

Set maximum length in minutes a round can last (default is 5)
Counter Strike Cheat Code : mp_roundtime (3-15)

Toggle auto-help hint messages (default is 1)
Counter Strike Cheat Code : ah (0)

Toggle crosshairs in observer mode (default is 1)
Counter Strike Cheat Code : cl_observercrosshair (0)

Toggle flashlight use (default is 1)
Counter Strike Cheat Code : mp_flashlight (0)

Toggle footsteps (default is 1)
Counter Strike Cheat Code : mp_footsteps (0)

Whiten all surroundings at 800x600 resolution
Counter Strike Cheat Code : r_lightmap 1

Turn off textures
Counter Strike Cheat Code : gl_picmic 3