-- [EMAIL PROTECTED] on 07/03/02 14:13:30 -0800
>
> This will run the job every 28 daze at 1am. If that's not exactly the
> definition of every 4th week let me know and I'll work something out. Also
> note that you will have an anomaly at the end of leap years.
>
>
> 0 1 * * * /usr/bin/ksh -c '[ $(($(date '+\%j') \% 28)) -eq 0 ] &&
> /path/to/my/job/the_job'
%j day of year (001..366)
Two problems are not adjusting the initial start date
(simple enough, adding a constant) and 365 % 28 != 0.
The last will give you an extended period once per
year. The only reliable way to handle this requries
gnu date, which has %s == system time in GMT:
[ $(( ($(date +%s) + $INITIAL_DATE_OFFSET) % 2419200 )) -eq 0 ] && /blah;
Is a bit grimy but works. The wallclock time may shift
slightly during the DST correction but the basic interval
works.
The one-second resolution can cause problems if crond
doesn't run exactly on the minute; this can be corrected
by taking the integer portion after dividing by 60 and
comparing that.
At which point it's better to give up on cron entirely
and use at, which does all of this mess for you and
handles cron outages also (which the above doesn't).
--
Steven Lembark 2930 W. Palmer
Workhorse Computing Chicago, IL 60647
+1 800 762 1582
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