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Full Discussion: Crontab running every alternative sunday
Top Forums UNIX for Dummies Questions & Answers Crontab running every alternative sunday Post 302406645 by denn on Tuesday 23rd of March 2010 12:46:32 PM
Old 03-23-2010
You could call a cron script every Sunday, and then use the modulus operator against the julian date to determine if its an odd, or even week, and run you commands depending on that result.

Code:
#!/usr/bin/bash

function doit {

  echo running cron entry
  # enter commands you want to run in this function #
}

JDATE=`date +%j | sed 's/^0//'`

RUNN=$(( $JDATE % 2 ))

[[ $RUNN -eq 0 ]] && doit || echo waiting until next week

Notes:
sed command is there to strip leading zero, which would be an issue.
If you want to run on even weeks, leave "-eq 0", or if you want to run on odd weeks
change it to "-eq 1"
 

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LEARN ABOUT CENTOS

yum-cron

yum-cron(8)															       yum-cron(8)

NAME

       yum-cron - an interface to convieniently call yum from cron

SYNOPSIS

       yum-cron [config-file]

DESCRIPTION

       yum-cron  is  an  alternate  interface to yum that is optimised to be convenient to call from cron.  It provides methods to keep repository
       metadata up to date, and to check for, download, and apply updates.  Rather than accepting many different command line arguments, the  dif-
       ferent functions of yum-cron can be accessed through config files.

       config-file  is	used  to optionally specify the path to the configuration file to use.	If it is not given, the default configuration file
       will be used.  It is useful to be able to specify different configuration files for different use cases.  For  example,	one  configuration
       file  might  be set to update the repository metadata, and a line could be added to the crontab to run yum-cron frequently using this file.
       Then, another configuration file might be set to install updates, and yum-cron could be run from cron using this file just once each day.

FILES

       /etc/yum/yum-cron.conf
       /etc/yum/yum-cron-hourly.conf

SEE ALSO

       yum (8)

AUTHORS

       See the Authors file included with this program.

BUGS

       There of course aren't any bugs, but if you find any, you should email
	the mailing list, yum@lists.baseurl.org, or consult bugzilla.

Nick Jacek															       yum-cron(8)
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