Date: 18 Aug 2002 16:13:36 -0700 From: Ken McGlothlen <mcglk@artlogix.com> To: "Defryn, Guy" <G.P.Defryn@massey.ac.nz> Cc: questions@freebsd.org Subject: Re: crontab Message-ID: <863ctbsqu7.fsf@ralf.artlogix.com> In-Reply-To: <98B01D2717B9D411B38F0008C7840931057F3B0E@its-xchg2.massey.ac.nz> References: <98B01D2717B9D411B38F0008C7840931057F3B0E@its-xchg2.massey.ac.nz>
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"Defryn, Guy" <G.P.Defryn@massey.ac.nz> writes:
| I have a question about Crontab. One of the options is the weekday.
|
| Is Sunday the first day or last day of the week.
|
| I have a feeling that this differs on your location
|
| How does Freebsd see this?
The day of week is a range from 0-6 (0 being Sunday). You can also use 7,
which also means Sunday. Or you can use day names.
Your FreeBSD box comes with the necessary documentation to figure this out:
$ man 5 crontab
[...]
The format of a cron command is very much the V7 standard, with a number
of upward-compatible extensions. Each line has five time and date fields,
[...]. Commands are executed by cron(8) when the minute, hour, and month
of year fields match the current time, and when at least one of the two
day fields (day of month, or day of week) matches the current time [...].
field allowed values
----- --------------
minute 0-59
hour 0-23
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sun, or use names)
A field may be an asterisk (*), which always stands for ``first-last''.
Ranges of numbers are allowed. Ranges are two numbers separated with a
hyphen. The specified range is inclusive. For example, 8-11 for an
``hours'' entry specifies execution at hours 8, 9, 10 and 11.
Lists are allowed. A list is a set of numbers (or ranges) separated by
commas. Examples: ``1,2,5,9'', ``0-4,8-12''.
Step values can be used in conjunction with ranges. Following a range
with ``/<number>'' specifies skips of the number's value through the
range. 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''). Steps are also permitted after an
asterisk, so if you want to say ``every two hours'', just use ``*/2''.
Names can also be used for the ``month'' and ``day of week'' fields. Use
the first three letters of the particular day or month (case doesn't mat-
ter). Ranges or lists of names are not allowed.
[...]
Note: The day of a command's execution can be specified by two fields --
day of month, and day of week. If both fields are restricted (ie, aren't
*), the command will be run when either field matches the current time.
For example, ``30 4 1,15 * 5'' would cause a command to be run at 4:30 am
on the 1st and 15th of each month, plus every Friday.
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 * * * *".
[...]
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