Advanced Cron programming help needed

[sbellmore01]

So using Cron on a linux box is a very handy tool. However, i'm trying to run a job on the first sunday of every month. And I'm not sure if it can be done. Using Legato schedules this can be accomplished quite easily but not with just linux.

Any help on the syntax of running a cron job on the First Sunday of Every Month would be greatly appreciated.

 

[GunnarD]

You could try this, not sure if it works:

* * 1-7 * 0 /command/to/run

 

[hoinz]

Hello,

this question has been asked on Unix/Linux forums quite a number of times.
Unfortunately GunnarD's solution will not work; it will run the program every sunday, and on the first 7 days of each month.

A common workaround is this:
Write a script that first has to check (via date +%d) if the day of the month is less than 8; if not so, the script will have to exit.
Then run this script in cron every sunday.

regards

 

[GunnarD]

It should work but it does not!

Does anyone have a clue why not?

 

[hoinz]

man crontab
Works as designed, I presume.

 

[GunnarD]

You could try this:

0 1 1-7 * * [ $(date "+\%a") = "\Sun" ] && echo "the first Sunday