Save as autoexec.cfg in cstrike/ folder. FastCup servers typically run a fastcup.cfg like this:
exec listip.cfg exec banned.cfg
// FastCup match config sv_restartround 0 sv_lan 0 sv_maxrate 25000 sv_minrate 2500 sv_maxupdaterate 101 sv_minupdaterate 20 sv_maxcmdrate 101 sv_mincmdrate 20 sv_aim 0 sv_cheats 0 sv_gravity 800 sv_airmove 1 sv_bounce 1 sv_clienttrace 1 sv_friction 4 sv_stepsize 18 sv_stopspeed 75 sv_wateraccelerate 10 sv_waterfriction 1 sv_accelerate 5.5 sv_spectatormaxspeed 500 cs 1.6 cfg fastcup