[Zope] cron

Greetings; Was reading up on zope labs on who to use cron and wget to call zope functions and Im almost there. What I would like to do is set a cron job to pack the db and flush the cache on a regular basis. Using the following URL on a test machine I can get there almost; http://XXXXX:xxxx@localhost:8181/Control_Panel/Database/manage_cacheGC but I am at a loss on how to activate the 'minimize' function as I dont know how to call it. Same scenario for 'pack' in ~/Database/manage Any clues would be greatly appreciated, or direction towards some docs on an alternative way of routinely packing the db and cleaning the cache.. Best and many thanks /ch