By 
You must enable the console
Changes speed of game, 0.1 = 10% of original game speed, 2 = twice the original game speed: host_timescale # (default=1)
Changes view to first person: firstperson
Changes view to third person: thirdperson
Creates a Companion Cube: ent_create_portal_companion_cube
Creates a reflector cube for lasers: ent_create_portal_reflector_cube
Invincibility: god
Lets you change the gravity in the game: sv_gravity # (600=normal)
Lets you go through walls and fly around: noclip
Place portals anywhere: sv_portal_placement_never_fail # (1 or 0)
Player can take damage but won’t die: buddha
Shoots conversion gel out of your face: ent_create_paint_bomb_portal
Shoots propulsion gel out of your face: ent_create_paint_bomb_speed
Shoots repulsion gel out of your face: ent_create_paint_bomb_jump
Shoots water out of your face: ent_create_paint_bomb_erase
Shows FPS Rate: cl_showfps 1
Turns Cheats on/off: sv_cheats (0=off/1=on)
Turrets won’t shoot at you: notarget
