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...