Here are a bunch of console commands. First Go into your Half-life 2 folder, and make a shortcut of hl2.exe. Open up the properties for the shortcut and type a space and add: -console. Now, when you load the game via the shortcut you will have the console already set up. Type (with out the quotes) "sv_cheats 1" to activate the cheatcodes.

Console CodesUse the [~] key during gameplay to bring up the console and enter the following codes there:
Code Effect
sk_plr_dmg_357 ## is new damage value for .357 Magnum
sk_plr_dmg_crossbow ## is new damage value for crossbow
sk_plr_dmg_crowbar ## is new damage value for crowbar
sk_plr_dmg_grenade ## is new damage value for grenades
sk_plr_dmg_pistol ## is new damage value for pistol
sk_plr_dmg_ar2 ## is new damage value for Pulse Rifle
sk_plr_dmg_rpg_round ## is new damage value for RPG rockets
sk_plr_dmg_buckshot ## is new damage value for shotgun
sk_plr_dmg_smg1_grenade ## is new damage value for SMG grenades
sk_plr_dmg_smg1 ## is new damage value for submachine gun
sk_max_357 ## is new max ammo for .357 Magnum
sk_max_crossbow ## is new max ammo for crossbow
sk_max_grenade ## is new max ammo for hand grenades
sk_max_pistol ## is new max ammo for pistol
sk_max_ar2 ## is new max ammo for Pulse Rifle
sk_max_ar2_altfire ## is new max ammo for Pulse Rifle energy orbs
sk_max_rpg_round ## is new max ammo for RPG
sk_max_buckshot ## is new max ammo for shotgun
sk_max_smg1_grenade ## is new max ammo for SMG grenades
sk_max_smg1 ## is new max ammo for submachine gun
sk_max_smg1 ## is new max ammo for submachine gun
weapon_357.357 Magnum
weapon_shotgun12-Gauge Shotgun
weapon_pistol9mm Pistol
net_graph 1a more thorough fps display
noclipAbility to walk through walls (Server Side Only)
sv_cheats 1Activates Cheats
viewmodel_fov #Adjusts size of the weapon you're carrying (54 = default)
impulse 101All Weapons
cl_showpos 1brings up position display in top right of screen (0 removes it)
getposcan be used to get current coords for use with setpos
skill #change skill level (# = 1, 2, or 3)
air_density #Change the density of air. (Add number in place of #)
physcannon_maxforce #Changes how hard you propel objects
physcannon_maxmass #Changes how large pulled objects can be
physcannon_pullforce #Changes how quickly objects are pulled
physcannon_tracelength #Changes the length that objects can be pulled from
physcannon_cone #Changes the radius of the cone used to pick up objects
npc_createCreates an NPC
npc_create_aimedCreates an NPC (Aiming away from player)
weapon_crossbowCrossbow
weapon_crowbarCrowbar
Hurtme #Damages player by whatever variable you input as #
mapsDisplays Map listing
+mlookEnables mouse look
cl_ragdoll_collide 1Enables ragdolls that don't clip through each other, but stack realistically on one another.
exec #Execute a script file (Input filename in place of #)
firstpersonFirst Person View
weapon_fragFragmentation Grenade
give #Give weapon (Input weapon name in place of #)
sv_infinite_aux_power 1gives infinite power for sprinting, etc.
sv_infinite_aux_power 1gives infinite power for sprinting, etc.
give weapon_annabellegives you Father Gregori's modified shotgun
GodGod Mode (Server side only)
impulse 76Grunt-O-Matic
sk_plr_num_shotgun_pellets #Increases pellets fired from each shotgun shell. 100 works well. 1000+ and it lags.
give item_batteryIncreases suit charge by 15 points.
notargetInvisible to NPC's
mat_numtextureunits #Limit the number of texture units. (Add number in place of #) (0=Default)
Map #Load Map (Input title in place of #)
setposMove player to specified origin
weapon_ar2Overwatch Standard Issue Pulse Rifle
weapon_bugbaitPherapods
sk_plr_dmg_buckshot #Raises damage done by each pellet.
sk_max_buckshot #Raises your max number of shells to that number.
give weapon_shotgunRecieve a Shotgun
buddhaReduces Health
mat_fullbright 1removes all shadows (a 0 restores them)
mat_fullbright 1removes all shadows (a 0 restores them)
impulse 203removes the item or NPC pointed at
impulse 203removes the item or NPC pointed at
help $replace $ with a command to get a brief description of it
weapon_rpgRocket-Propelled Grenade Launcher
mat_depthbias_normal 1See through walls
sv_gravity #Set Gravity (Add number in place of #)
dsp_explosion_effect_duration #Set length of confusion/ear-ringing effect(Add number in place of #)
sv_stopspeed #Set Minimum Stopping Speed on ground (Add number in place of #)
sv_waterdist #Set Vertical View when eyes are near water plane.
sv_friction #Set World Friction (Add number in place of #)
sv_bounce #Sets bounce multiplier for physically simulated object collisions
Developer #Sets developer mode to on/off/verbose (0-off, 1-on, 2-verbose)
sv_maxvelocity #Sets Maximum Velocity of any moving object (Add number in place of #)
hud_quickhelp/text? 1Shows Crosshairs
cl_showfps 1Shows FPS Rate
statusshows some game info, incl. current map
setangSnap players eyes to a specified pitch yaw
impulse 82Spawn a Jeep
impulse 83Spawn an Air Boat
give item_ammo_357Spawns ammo for the .357 magnum
give item_box_sroundsSpawns ammo for the 9mm pistol
give item_ammo_crossbowSpawns ammo for the crossbow
give item_ammo_ar2_altfireSpawns energy grenade for the Overwatch Pulse Rifle
give item_rpg_round OR give item_ml_grenadeSpawns grenades for the RPG
give item_ar2_grenadeSpawns grenades for the submachinegun, oddly enough..........
give item_ammo_ar2Spawns primary fire ammo for the Overwatch Pulse Rifle
give item_box_mroundsSpawns primary fire ammo for the submachinegun
give item_box_buckshotSpawns shells for the 12-gauge shotgun
weapon_smg1Submachine Gun
thirdpersonThird Person View
prop_debugToggle bounding-boxes debug mode on/off red - ignore damage, white - respond to damage, green - health)
cl_drawhud 1Toggle HUD display On
cl_enablehud 1Toggle HUD display On
sv_soundemitter_filecheckToggle reporting missing .wav files for sounds
ai_disabletoggles enemy AI on/off
pickerToggles Picker mode on
sv_unlockedchapters #unlocks chapters 1 thru # (15 is end credits)
weapon_physcannonZero Point Energy Field Manipulator Gun