On 10.03.19 21:05, Markus Ueberall wrote:
> # m h dom mon dow user command
> 00 05 1-7 1,3,5,7,9,11 SAT sys-maint some-task some-option
> #host1
> 00 05 8-14 1,3,5,7,9,11 SAT sys-maint some-task some-option
> #host2
> 00 05 15-21 1,3,5,7,9,11 SAT sys-maint some-task some-option
> #host3
> 00 05 22-28 1,3,5,7,9,11 SAT sys-maint some-task some-option
> #host4
> The expectation was that none of the entries is executed in parallel
> at any given point in time due to column three> (day-of-month range)
This frequently occurring mistake is an unfortunate result of the
crontab(5) specification.
Quoting the man page:
> 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 (i.e.,
> 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.
In short: it's not dom AND dow, but dom OR dow.
Consequently, your specification of SAT in column 5 trumps your
specification of column 3.
The man page contains an example for how to work around this.
--
Christian Kastner
** Changed in: cron (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1819369
Title:
When specifying minute,hour,day-of-month,month,day-of-week
values/ranges, given day-of-month range is *ignored*
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