Date: Sun, 16 Sep 2001 20:07:14 -0500 From: Alfred Perlstein <bright@mu.org> To: Ben Smithurst <ben@FreeBSD.org> Cc: Tim Allshorn <ta_iy@hotmail.com>, freebsd-hackers@freebsd.org Subject: Re: Cron pickle Message-ID: <20010916200714.X968@elvis.mu.org> In-Reply-To: <20010917014932.V43502@strontium.shef.vinosystems.com>; from ben@FreeBSD.org on Mon, Sep 17, 2001 at 01:49:32AM %2B0100 References: <F243F4r4rPKlNonsYKU00010632@hotmail.com> <20010917014932.V43502@strontium.shef.vinosystems.com>
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* Ben Smithurst <ben@FreeBSD.org> [010916 19:49] wrote: > Tim Allshorn wrote: > > > I know the cron command has to be something like : 59 23 ? ? * , with > > maybe some condition on the end. > > I think you could use something like > > 59 23 28-31 * * [ `date -v+1M +%d` -eq 1 ] && /path/to/your/program > > i.e., check that in one minute's time the day of the month is 1, if so, > run the program. I'm not a date(1) wizard, but there's a possible issue here, if the system is loaded cron may skip a beat possibly and that conditional may be delayed such that it doesn't trigger. My suggestion would be to use something more sophisticated such as a file someplace that tracks the last time it was run to make sure there's no race here. -- -Alfred Perlstein [alfred@freebsd.org] 'Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom.' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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