semi-automatic updates - how to achive?

[update]

Good morning to all
I'm wondering if there is a possibility to keep a bunch of let's say (example ) hundred installations up do date continuously. Perhaps thee is some more commonly usable method out there than fiddling around manually?
Some point and click (no, not that device, Jürgen ) method where it is copying new files into a list of folders / accounts?
I used to use the skel-folder for setting up new accounts with phpwcms but I mean to keep them up to date all the time....
Any idea would be great

[juergen]

My dear

there is a method if you have shell script access. wget http://waswasnichwoher/gurm.zip
unzip in your account .. splash !

[Oliver Georgi]

It is a hard task.

There are things that has to be done to solve it better as the current update mode:
- FTP support to avoid permission restrictions
- Move templates and settings to database to allow easy merging
- implement Diff tool for comparing

[update]

Thanks for stepping in - yes, this seems to be a not-so-easy task.
hmmm... I'll do it by hand for now
But would be cool anyway to have this possibility, let's say as a module for example - kind of an internal svn mechanism... an exclude list added...
Yes, I can see the problem with the diff....
Templates in DB? Great!