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Top Forums UNIX for Advanced & Expert Users Use cron to run job every other week Post 302460747 by jim mcnamara on Thursday 7th of October 2010 12:59:54 PM
Old 10-07-2010
That won't work - if it ran say on the 30th it will also run on the week of 1 - 7.

And the answer is no - just using the crontab * * * * * entries there is no reliable way.
You need to alter the command structure - the part calling your script

Assuming your system supports
Code:
date +%s

Because every second Friday is an odd number of days since Thursday, Jan 1, 1970 and
every first Friday is an even number; plus there are 86400 seconds in a day:

when you execute this every friday it will test the day and run
Code:
# "first" friday  -- and note # generally does work in crontab files as a comment
0 8 ** 6  [ $((  $(( $(date +%s ) / 86400  )) % 2 )) -eq 0 ] && /path/to/myjob
#  "second" friday
0 8 ** 6  [ $((  $(( $(date +%s ) / 86400  )) % 2 )) -eq 1 ] && /path/to/myjob

 

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queuedefs(4)							   File Formats 						      queuedefs(4)

NAME
queuedefs - queue description file for at, batch, and cron SYNOPSIS
/etc/cron.d/queuedefs DESCRIPTION
The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue. The format of the lines are as follows: q.[njobj][nicen][nwaitw] The fields in this line are: q The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs started by batch (see at(1)); c is the default queue for jobs run from a crontab(1) file. njob The maximum number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first njob jobs will be run, and the others will be run as jobs that are currently running terminate. The default value is 100. nice The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user. The default value is 2. nwait The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in that job's queue, or because the system-wide limit of jobs executing has been reached. The default value is 60. Lines beginning with # are comments, and are ignored. EXAMPLES
Example 1: A sample file. # # a.4j1n b.2j2n90w This file specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value of 1. As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before trying again to run it. The b queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2. If a job cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All other queues can have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs are running cron will wait 60 seconds before trying again to run it. FILES
/etc/cron.d/queuedefs queue description file for at, batch, and cron. SEE ALSO
at(1), crontab(1), nice(1), cron(1M) SunOS 5.10 1 Mar 1994 queuedefs(4)
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