On Wed, 17 Apr 2002, "Thomas M. Albright" <[EMAIL PROTECTED]> wrote:
>
> The dates are stored as mm/dd/yyyy. When the Payment Due date is equal
> to today + 90 days (IOW: 90 days before the due date) I want to send out
> an email containing an invoice to "Contact email".
>
> Most of that I can figure out on my own. The only problem I really have
> is with the dates. I know 'date +%x` will output the current date as
> mm/dd/yyyy. `date +%j` will give me the day of the year (eg.: today is
> 107). Using that format quits working sometime in October tho. (10/3 is
> 276 + 90 = 366)
I like to write shell scripts that are portable to all Unixes, but using
gnu date is my one vice :-) Indeed, I install it as "gdate" on most
machines I use so I can do time manipulation in sh scripts.
I think your problem can be solved by using the gnu date "n days",
"n days ago", etc, tricks in the -d "date string" option:
% date
Wed Apr 17 22:55:55 EDT 2002
% date -d "90 days ago"
Thu Jan 17 22:56:02 EST 2002
% date -d "90 days"
Tue Jul 16 22:56:06 EDT 2002
Works the same with "days" replaced by "seconds", "minutes", "years", etc.
It even does "n months ago" somehow. There can also be a real date in the
-d string, e.g. -d "01/12/1989 90 days ago"
So I think your case would look like:
DUEDATE=`somehow read it in`
if [ "$DUEDATE" = `date +%m/%d/%Y -d "90 days"` ]; then
echo "Please pay me $AMOUNT" | mail -s Invoice $CUSTOMER
fi
or something like that. If instead of a test for "=" you need a test
for "<=" I suggest using +%s for *both* dates and doing a numerical compare.
Karl
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