Linux – CronJob Every 25 Minutes

cronlinux

I want to know whether there is any easier way to run a job every 25 minutes. In cronjob, if you specify the minute parameter as */25, it'll run only on 25th and 50th minute of every hour

Best Answer

The command in crontab is executed with /bin/sh so you can use arithmetic expansion to calculate whether the current minute modulo 25 equals zero:

*/5 * * * * [ $(( $(date +\%s) / 60 \% 25 )) -eq 0 ] && your_command

cron will run this entire entry every 5 minutes, but only if the current minute (in minutes since the epoch) modulo 25 equals zero will it run your_command.

As others have pointed out, 1 day is not evenly divisible by 25 minutes, so this will not cause your_command to run at the same time every day, but it will run every 25 minutes.

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Cronjob to run every 30 minutes

0,30 9-18 * * * /path_to_script

However, the above will run at 18:30. So, you're best bet is to have a separate job to handle 18:00. So:

0,30 9-17 * * * /path_to_script
0 18 * * * /path_to_script

Also, Cron job generators are awesome.

How to Run a Cron Job Randomly Every Hour in Ubuntu

You can do this by defining a job which runs every hour on the hour, and sleeps for a random amount of time before running the command you're actually interested in. In your crontab:

SHELL=/bin/bash

0 * * * * sleep $((RANDOM*3600/32768)) && command

(You need to specify the shell, to ensure that $RANDOM is available. There are other ways of getting a random value for sleep if that's not appropriate.)

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