[Zope-CMF] Extracting data from ZODB

[Tim Terlegård]

What's the best way to extract data from a ZODB with a python
script used with cron?

Background:
I have a site using Zope. When someone registers a new user they
get an email alias pointing to some other email address. Every night
I'd like to update the system with the current email aliases. So what
I'd like is to extract username, email and build an /etc/aliases file and
use /bin/newaliases on that. I guess this is someting for cron. How
do I access and extract data from the ZODB without using the ZMI?

Thanks,
Tim