cronjob question?

[Ridzuan Zakaria]

Hi,

How do I schedule a job to run every third Monday of the month?

Thanks.

[Alex Lavrov.]

I don't think it's possible with cron.

You can specify weekday and month day, but not both. But you can write custom script that run monday and check if it's third monday of the months and if yes it runs it.

[Pete Randall]

You don't. You schedule it to run every Monday and determine in the script itself if the day of the month falls between 15 and 22.


Pete

[Jean-Luc Oudart]

Similar question (for a different day)

see thread
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=827914

Regards
Jean-Luc

[A. Clay Stephenson · Accepted solution]

Cron by itself can't do this. You need to schedule the cronjob to run every Monday and then the script itself needs to test whether or not this is the 3rd Monday of a given month. The easist solution is caljd.sh. I'll assume that you install the attached script in /usr/local/bin

#!/usr/bin/sh

export PATH=${PATH}:/usr/local/bin

if [[ $(caljd.sh -N) -eq 3 ]]
then
echo "It's the 3rd Monday; do your thing"
else
exit 0
fi

Invoke as caljd.sh -u for full usage and examples.

[Ridzuan Zakaria]

Thanks. I used solution provided by Clay.