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

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.

See Question&Answers more detail:os

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Do:

0,30 * * * * your_command

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