Date: 01 Mar 2005 14:10:52 -0500 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: "Eugene M. Minkovskii" <emin@mccme.ru> Cc: freebsd-questions@freebsd.org Subject: Re: crontab synatx Message-ID: <44zmxn41xf.fsf@be-well.ilk.org> In-Reply-To: <20050301072235.GA24150@mccme.ru> References: <20050301072235.GA24150@mccme.ru>
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"Eugene M. Minkovskii" <emin@mccme.ru> writes: > I put in my crontab following string: > > # min hour mday month wday command > 0 7 */3 * * echo "Hello world" > > So, I hope, this command will be workind every third day: > 3,6,9,12 etc, because at man crontab we read: > > <man 5 crontab> > For example, ``0-23/2'' can be used in the hours field to specify > command execution every other hour (the alternative in the V7 > standard is ``0,2,4,6,8,10,12,14,16,18,20,22''). > </man 5 crontab> > > But, my command worked at 28 feb, and 1 march. The way the "/3" syntax works is that it specifies a "skip" in the values. It doesn't affect what the *first* value is, so for day of month, the first value is 1. Then it will skip 3, and will execute again on the 4th. I haven't tested this, but I think you could get what you want by saying "3-31/3" for the mday value. > Other case I type > > # min hour mday month wday command > 0 7 */14 * * echo "Hello world" > > And this is work at 15 febr. Is it bug or feature? As in the previous example, I think this behavior is exactly what the documentation describes. If you want the 14th and the 28th of every month, just put "14,28" in that field of the crontabl > Is it bug or feature? Perhaps > crontab count day of month from zero? No, it counts from one, as everyone would expect. This is required behavior according to POSIX. > If so, when should work > command if I type directly number of day: > > # min hour mday month wday command > 0 7 14 * * echo "Hello world" That will execute at 7:00 AM on the 14th of every month. > And how will be counted months? January is 1, December is 12. -- Lowell Gilbert, embedded/networking software engineer, Boston area http://be-well.ilk.org/~lowell/
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