Press the tilde button and enter any of the codes and press enter:

Effect                            Code
Third person view                 behindview <0 or 1>
                                  (0 means off 1 means on)
Flight mode                       ghost
Disable flight                    walk
Full ammunition                   fullammo
Record demo                       demorec
Stop recording                    stopdemo
Play demo                         demoplay
God mode for player               god
God mode for team                 godteam
God mode for terrorists           godterro
God mode for hostages             godhostage 1
Disable god mode (hostages)       godhostage 2
All the god modes                 godall
Game never ends                   toggleunlimitedpractice
Walk through entities             togglecollision
View threat information           togglethreatinfo
Kill all terrorists               neutralizeterro
Disarm all bombs                  disarmbombs
Deactivate IO devices             deactivateiodevice
Rescue all hostages               rescutehostage
Disable morality                  disablemorality
Summon all terrorists             callterro
Invisible to terrorists           playerinvisible
Terrorists surrender on sight     tsurrender
Terrorists shoot wildly           tsprayfire
Terrorists only fire at you       taimedfire
Terrorists all run away           trunaway
Terrorists go back to normal      tnothreat
See all terrorists on map         rendspot
Hostage threat information        togglehostagethreat
Set hostage position              sethpos <0-5>
                                  (0 standing, 1 kneeling, 2 prone,
                                  3 fetal, 4 crouched, 5 random)
Reset hostage threat              resetthreat
Next hostage animation            hna
Previous hostage animation        hpa
Animate hostage                   hp <0 or 1>
                                  (0 for no loop, 1 for looping)
Show field of vision              showfov
Show weapon direction             gundirection
Show terrorist/hostage routes     route
Show all map routes               routeall
Remove all NPCs                   killthemall
Remove all terrorists             killterro
Remove all hostages               killhostage
Kill all Rainbow operatives       killrainbow
Remove opponents                  killpawns
Game modes                        sgi
Resets all cheats                 resetmeall
Quit game                         quit