Very Computer

1. Date arithmetic

I have a ksh script that needs to check the current date and the
expiration date for an account, compute the number of days until
expiration, and report to the user when that gets less than some chosen
value.  The expiration date will be read from an ASCII file.  Its format
has not been set, so it can be whatever is easiest (yy/mm/dd, mm/dd/yy,
etc.).  Perl could do this quite nicely, but perl isn't available on all
the systems the script must run on.  I vaguely recall a discussion of
date arithmetic here some weeks ago, but of course then I didn't have a
need.  What is the best way to do this with "standard" Unix commands?

Amaze me again with your creativity!

--
Ed Moore
Hewlett-Packard
Vancouver, WA, USA

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