Question 1

How can one schedule a cron job for every Monday, Wednesday and Friday at 7:00 pm?

Accepted Answer

Use `0 19 * * 1,3,5 command`. Day-of-week 1=Monday, 3=Wednesday, 5=Friday. Most schedulers also accept name aliases — `0 19 * * MON,WED,FRI` is equivalent and more readable. For weekdays only use `1-5`, weekends only use `0,6`.

Question 2

How do I set a cron job to run twice a week (bi-weekly)?

Accepted Answer

Use `0 0 * * 1,4 command` for twice-weekly (Monday and Thursday) or `0 0 * * MON,THU command` with name aliases. True bi-weekly (every other Monday) isn't native to cron — wrap a weekly cron with a script that exits on odd/even ISO weeks: `0 9 * * 1 [ $(($(date +%V) % 2)) -eq 0 ] && /path/to/script.sh`.

Question 3

How do I set up a cron job that runs every day at 1PM, 2PM and 3PM?

Accepted Answer

Use a comma list in the hour field: `0 13,14,15 * * * command` runs at 13:00, 14:00 and 15:00. For consecutive hours, the equivalent range form is `0 13-15 * * *`. Non-consecutive times only work with the list form: `0 13,16,21 * * *`. If minutes differ per hour, use separate cron lines.

Question 4

Can I run a cronjob every three days?

Accepted Answer

Use `0 0 1-30/3 * * command`. The day-of-month `1-30/3` expands to 1, 4, 7, 10, …, 28 — ten runs per month at every 3rd day starting from the 1st. The cadence resets at each month boundary, so February's first run lands on the 1st even if the previous month's last was on the 28th. For strict 72-hour intervals, use a job runner instead.

How can one schedule a cron job for every Monday, Wednesday and Friday at 7:00 pm?

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April 2026

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