unix question

From: <ryan_oracle_at_cox.net>
Date: Wed, 19 Nov 2003 12:20:33 -0800
Message-ID: <F001.005D72FC.20031119122033@fatcity.com>

I want to store some files. I make a new copy every night. I want to archive it back 4 days. So after 4 days, I want to delete the old copy. How do I do this?

However, if i miss a nightly batch and have less than 4 copies, I do not want to delete any?  

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Author: <ryan_oracle_at_cox.net
  INET: ryan_oracle_at_cox.net

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