Start the game by running the game from your RUN menu with:
"C:\GameFolder\bshift.exe" -console 

     Now you can bring down the console command box at any time during
the game with the ~ key (tilde). Now before loading a map or game, you
must  open  your  console  and  type  "sv_cheats  1"  (excluding  "").
Alternatively     you     may    place    the    command    in    your
"C:\GameFolder\config.cfg"   file   with   notepad,   so  it  will  be
automatically set next time you open the game.

     You may now use the following commands (excluding ""):

"god" - God Mode 

"notarget" - No Target Mode 

"noclip" - NOCLIP Mode : Fly through walls 

"impulse 101" - Gives all weapons 

"sv_gravity x" - Adjusts Gravity where when X = 800 the game uses
                 default gravity and when X = 0 there is no gravity. 

"sv_accelerate x" - Adjusts air acceleration so you move more when
                    you jump. Default = 10 but increase for more
                    effective bunnyhopping :) 

"skill x" - Adjusts skill in-game, 1 = Easiest, 3 = Hardest. 

"map x" - Replace X with one of the following maps: 

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