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I just want to know which one should work just fine for Run every 6 hours forever:

0   */6 *   *   *


*   */6 *   *   *


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migrated from Dec 3 '12 at 1:54

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I would say the first one. It will run once every six hours. You can also try to set specific hours like this:

00 2,8,14,20 * * * 

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