>> $ cat >> /etc/anacrontab
>> 20 33 debaday wwwoffle http://www.livejournal.com/users/debaday

A> For the benefit of those of us that don't use anacron can you explain
A> how this will request the page every 20th day and which is the first
A> day that it will start?

This says every 20 days, starting today, do wwwoffle ...
One could append >/dev/null so no Getting messages go to one's
mailbox.  The  appearance of the page in lasttime will be one's only
notice, and then of course it won't appear if not changed, quite nice
in fact.
$ man anacron
...Anacron can be used to execute commands periodically, with a frequency
specified in days.  Unlike cron(8), it does not assume that the
machine is running continuously... Each job entry specifies a period
in days, a delay in minutes, a unique job identifier, and a shell
command.  For each job, Anacron checks whether this job has been
executed in the last n days, where n is the period specified for that
job.  If not, Anacron runs the job's shell command, after waiting for
the number of minutes specified as the delay parameter...

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