I'm doing a backup script, where I want to select all
files modified during the last three days.

I would do that with pax's -T option.
(find(1) isn't an option as I have a backup.conf which
contains all the paths and filenames to backup)

So, how can i get a date from three days ago?
date(1) doesn't have an option like 

   date '+ 3 days ago'

How are you people doing this?
(without writing a c program, of course)

Thanks in advance for any hints.

Chris

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Christoph Kaegi                                           kgc@zhwin.ch
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