Halflife: Blue Shift
It is also reported you can go to the console by pressing ~ then type in sv_cheats 1 instead of having to do the command line parameter above.  These cheats can also be places in the C:\GameFolder\config.cfg file so they load each time with the game.
Invincibility /god
Go to Map (insert map name for name) /map name
Get Item (Insert item name for item) /give item
Weapons & Ammo impulse 101
No Clipping & Flight /noclip
Give Weapon /give weapon ###
Gravity change Use numbers 10-800 for ## sv_gavity ##
Enemies ignore you /notarget

tems for Give code

ammo_556
ammo_762

Items for Give Weapon code

GRAPPLE
KNIFE
PIPEWRENCH
EAGLE
M249
SNIPERRIFLE
DISPLACER
SHOCKRIFLE
SPORELAUNCHER

Map Names for /map above

ba_canal1
ba_canal1b
ba_canal2
ba_canal3
ba_elevator
ba_hazard1
ba_hazard2
ba_hazard3
ba_hazard4
ba_hazard5
ba_hazard6
ba_maint
ba_outro
ba_power1
ba_power2
ba_security1
ba_security2
ba_teleport1
ba_teleport2
ba_tram1
ba_tram2
ba_tram3
ba_xen1
ba_xen2
ba_xen3
ba_xen4
ba_xen5
ba_xen6
ba_yard1
ba_yard2
ba_yard3
ba_yard3a
ba_yard3b
ba_yard4
ba_yard4a
ba_yard5
ba_yard5a
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