RepairHomePermissions guides the user through the Finder preliminaries, then runs the first command if an error code is encountered. If that returns an error of the type quoted by Apple, it then runs the second command, and tries the first again after that. However, if you are using Time Machine backups, be prepared for that large and long backup after you have repaired permissions, and be ready to restore from backup or correct permissions afterwards if the procedure breaks anything.
Mall Creeps
