if you get this for the first time you will need to fire up the terminal and type:
sudo chmod +x "path to q3map2 radbump" it will prompt you for password, type you computer password, (a password on your comp is required) (it will be invisible in your terminal) then hit enter and then you just type:
./q3map2.ppc -add commands here- [map file here] and away it goes....