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If optional arguments mailing-list exist, then each one is mailed a notification message explaining whose birthday it is. This is most useful if mailing-list is really a mailing list, so that a reasonable number of people can be notified of their co-workers birthdays.
If birthdays is passed the -n switch, then no mailing is done; rather, the list of people who are having a birthday is printed to the stdout.
Birthdays is best run from within a crontab; it only should run once a day. Here is an example crontab entry:
0 4 * * * root /usr/local/bin/birthdays firstname.lastname@example.org
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