Enter the console (retail versions require CS to be started with "-console" command line parameter) on the server machine and enter "sv_cheats 1". You can change maps by typing "changelevel dust" (or any other map name). Now enter one of the following codes at the console:
CODE - EFFECT give weapon_awp - Arctic sniper rifle (see below for other weapon spawns) sv_gravity <-999 - 999999> - Adjust gravity impulse101 - $16,000 dollars sv_clinettrace 9999 - Hit an enemy even it he/she is not in the center of the crosshair but is still on your screen. "+forward; model arctic - Artic terrorist skin autoteambalance 0 - Turn auto-balance off autoteambalance 1 - Turn auto-balance on mousesensitivity 0.1 - Very slowest w/ low sensitivity mousesensitivity 9.9 - The fastest w/ high sensitivity