Install Notes
Place the included Autoexec.cfg in the Config dir of
Half-Life 2

Usual this is: C:\Valve\Steam\SteamApps\<userid>\Half-Life 2\cfg\
(If this directory doesn't exist start the game first and edit the
controls or something) Enjoy.

And remember to Support Valve and BUY the Game!

use the [~] key US or [¬] key UK keyboard while playing to bring up the console and enter the following codes there:
now here are some Cheats:
god Toggles Godmode
Impulse 101 Gives you everything
NoTarget Monsters won't see you (on/off)
NoClip Fly around and walk trough walls
sv_infinite_aux_power 1 Gives Unlimited Battery Power
sv_show_crosshair_target 1 Shows if and NPC is Enemy or Friend

if you want more cheat codes use codes from option 2

one last warning: Cheating will reduce the time and enjoyment of your game.
Please read the virility Info in the zip file

"C:\Program Files\Half-Life 2\hl2.exe" -console

Click Apply to save the changes and run the game using that shortcut. Now, use the [~] key US or [¬] key UK keyboard while playing to bring up the console and enter the following codes there:

god – God mode (server side only)
give – Gives a weapon or an item (see the list below)
buddha – Reduces your health
hurtme # – Hurts the player (# is damage amount)
impulse 101 – All weapons
impulse 82 – Spawns a jeep
notarget – Player becomes hidden to NPCs
noclip – Walk through walls (server side only)
maps – Displays map list
map – Load a specified map (see the list below)
developer # – Sets developer mode to on/off/verbose (0-off, 1-on, 2-verbose)
+mlook – Enables mouse look
hud_quickhelp/text? 1 – Shows crosshair
viewmodel_fov # – Sets the size of the weapon you're carrying (54 is default)
exec – Execute a script file
cl_drawhud 1 – Turns hud display on
cl_enablehud 1 – Turns hud display on
cl_showfps 1 – Shows frames per second in game
npc_create – Creates an NPC (works in worlds that have an NPC entity)
npc_create_aimed – Creates an NPC aiming away from the player.
picker – Toggles 'picker' mode.
setpos – Move player to specified origin (must have sv_cheats 1 enabled).
setang – Snap player eyes to specified pitch yaw (musthave sv_cheats).
sv_gravity # – Set gravity to #
sv_stopspeed # – Set minimum stopping speed when on ground to #
sv_friction # – Sets world friction to #
sv_bounce # – Sets bounce multiplier for physically simulated objects collision
sv_maxvelocity # – Sets the maximum velocity of any moving object to #
sv_waterdist # – Sets vertical view fixup when eyes are near water plane to #
air_density # – Changes the density of air to #
dsp_explosion_effect_duration # – Sets length of confusion/ear-ringing effect to #
prop_debug – Toggle bounding-boxes debug mode on/off (red - ignore damage, white - respond to damage, green - health)
sv_soundemitter_filecheck – Toggle reporting missing .wav files for sounds
mat_numtextureunits # – Limits the number of texture units to # (0 - let the game decide how many texture units to use)