Changing UserID in MacOS 10.5.x Leopard
by There is no NetInfo-Tool any more. So you have to use the Command Line Tool dscl.
(For more info type “man dscl”)
So to change the userid (UID) of user db2admin from 502 to 507 type:
sudo dscl . -change /Users/db2admin UniqueID 502 507