How would I get a cron job to run every 30 minutes?

Asked 2009-02-25T05:06:27.080

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I'm looking to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something close. I have the following, but it doesn't seem to run on 0.

*/30 * * * *

What string do I need to use?

The cron is running on OSX.

linux macos cron

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1 Answer

Try this:

0,30 * * * * your command goes here

According to the official Mac OS X crontab(5) manpage, the / syntax is supported. Thus, to figure out why it wasn't working for you, you'll need to look at the logs for cron. In those logs, you should find a clear failure message.

Note: Mac OS X appears to use Vixie Cron, the same as Linux and the BSDs.

answered 2009-02-25T05:08:50.240

How would I get a cron job to run every 30 minutes?

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