🚀 go-pugleaf

Is there any utility that will take an image of a hard drive, and compare
that image with one taken earlier?  By image I mean a record of the names  
of all the files on the drive, their location, size, last date of  
modification, etc.  I need to keep a few dozen Macs clean
for users to use (clean=all apps, pref files, inits, extensions, all
supporting file for all apps, etc. in their proper place, system files not
tampered with, etc.), and I have a few malicious hackers and a few
hopeless incompetents (okay, more than a few, in both cases) who insist on
tampering with my Macs.  Each day, I'd like to take an image of the hard
drive and, if the image is different from the previous day's image, take
appropriate action (delete files, move files, retrive files from the
server).  Oh yeah, I really don't like FolderBolt.

Which brings me to another problem:  Is there any way to automate this?
I'd like something like the UNIX cron, with which I can execute a command
(run an application) at any given time, with any given frequency.

Please respond by e-mail.

Thanks a bunch,
Gene.
gene@icarus.claremont.edu