[Zope] How to upload files into ZODB via shell script

Hello, I just want to upload some files (PDF and Image files, partly targeted to an ExtFile object) to Zope once some event occures on my system (triggered by a cron job or a certain mail reaching the system). Is there a straigthforeward way to do so? If not I guess I have to use an SQL database and store the objects I want to use there. Kind regards Andreas.