Every 3 Hours Cron

Example:

0 */3 * * * /opt/tri-hourly-task.sh

Use 0 */3 * * * to run every 3 hours starting at midnight: 0:00, 3:00, 6:00, 9:00, 12:00, 15:00, 18:00, 21:00.

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FAQs

How to start at a different hour?

Use 0 1-23/3 * * * to start at 1:00 AM instead of midnight.