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From: Mike Jeays <mj001@rogers.com>
To: Nikos Vassiliadis <nvass@teledome.gr>
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Date: Thu, 15 Dec 2005 09:08:02 -0500
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Cc: FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: rc question: one-time script
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On Thu, 2005-12-15 at 15:53 +0200, Nikos Vassiliadis wrote:
> Hello list,
> 
> Is there any way of runnning a script, only once?
> at boot time for example? and all that in an rc friendly
> way, without having to change the /etc/rc* scripts?
> 
> thanks in advance
> 
> Nikos
> 
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This quote from 'man 5 crontab' should help.

 Instead of the first five fields, one of eight special strings may
     appear:

           string          meaning
           ------          -------
           @reboot         Run once, at startup.
           @yearly         Run once a year, "0 0 1 1 *".
           @annually       (same as @yearly)
           @monthly        Run once a month, "0 0 1 * *".
           @weekly         Run once a week, "0 0 * * 0".
           @daily          Run once a day, "0 0 * * *".
           @midnight       (same as @daily)
           @hourly         Run once an hour, "0 * * * *".