Crontab job on sunday with two week interval Post: 302176907

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Operating Systems AIX Crontab job on sunday with two week interval Post 302176907 by Dave Miller on Wednesday 19th of March 2008 02:10:45 PM

03-19-2008

Registered User

You'd think that the crontab line would be something like this:

[minute] [hour] 1-7,15-24 * 0 [function]

I.E. You're saying run the function at the time specified every Sunday of every month, when the date is 1st thru 7th or 15th thru 24th.

This creates two problems:

A - Because of a quirk in cron, the job will actually run EVERY Sunday AS WELL AS every day from the 1st to the 7th and 15th to the 24th.
B - If that quirk did not exist, you'll miss a week when there are 5 Sundays in the month (this may or may not be a problem for you),

Simple solution:

Have cron run it EVERY Sunday. Then have your script either check the current date, assuming you want to skip the 5th Sunday of the month), or check and set a flag in a file to indicate if it ran that week or not.

Note: This second idea is essentially what Bakunin said.

Dave Miller

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