Crontab Run Every 15 Minutes Except at 3Am

Crontab run every 15 minutes except at 3AM?

With one cron line, no. With three, yes:

# Every 15 minutes except for 3:00-3:59
*/15 0-2,4-23 * * * thejob
# 3:15, 3:30, 3:45
15-45/15 3 * * * thejob
# 3:00 dead
0 3 * * * otherjob

crontab run every 15 minutes between certain hours

Your command is fine!

To run from 7.00 until 19.45, every 15 minutes just use */15 as follows:

*/15    07-19        *     * *     /path/script
^^^^    ^^^^^

That is, the content */15 in the minutes column will do something every 15 minutes, while the second column, for hours, will do that thing on the specified range of hours.

If you want it to run until 19.00 then you have to write two lines:

*/15    07-18        *     * *     /path/script
0          19        *     * *     /path/script

You can have a full description of the command in crontab.guru: https://crontab.guru/#/15_7-19___

Crontab except specific hours

I believe you want this rule:

0 0,30 6/1 ? * * *

This runs at 0 minutes and 30 minutes past the hour, and every hour after the 6th hour.

This assumes that your system timezone is in an ET timezone like America/New_York

How to schedule Crontab in Linux to run for every minutes of X?

I have found the solution:

If X is 5, I will just do it this way in crontab -e:

5,15,25,35,45,55 * * * * run anytask

If X is 3, then:

3,13,23,33,43,53 * * * * run anytask

Cron expression for each 5 minutes except hours between 01:00 and 02:00?

Did you try this :

0 0/5 0,2-23 * * ?

3 cronjobs, 15 minute intervals, 5 minutes apart

This should do

*/15 * * * * /command/to/execute >/dev/null 2>&1
5,20,35,50 * * * * /command/to/execute >/dev/null 2>&1
10,25,40,55 * * * * /command/to/execute >/dev/null 2>&1

Running a cron job at 2:30 AM everyday

crontab -e

add:

30 2 * * * /your/command

cron expression for every 30 minutes from 9am to 9pm and once at 3am midnight

Unluckily it is not possible to create it in a single cron. You will have to create 2 separate crons one which does the 30 minutes 9-21 like you have it and one to run it once at 3am.

---

Related Topics