The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 0 30 */3 *
This cron command translates to the following (in Human-Readable format):
“Every 3 months on day 30 of the month.”
What is a Cron Job & Crontab?
A cron job is a task that is scheduled to run at a specified time or interval. Cron jobs are commonly used to automate system maintenance or administration tasks, such as running backups or sending emails.
A crontab is a file containing commands and instructions for the cron daemon to execute.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 months on day 30 of the month“:
FUN FACT: When troubleshooting issues with cron jobs, it can be helpful to run them manually from the command line – this will allow you to see any error messages that might be generated..
You might want to set up a crontab or cron job to run every 3 months on day 30 of the month for several reasons, including:
- Checking for updates to a software package
- Generating monthly reports
- Cleaning up temporary files
Similar Cron Jobs
You might also want to run a crontab:
- every 5 months
- every 2 months
- every 6 months
- every 3 months
- every 1 month
- every 4 months on day 23 of the month
- every 4 months on day 21 of the month
FUN FACT: Cron is one of the most versatile tools in a Linux administrator’s toolbox..
In this article, you learned how to set up a cron job that runs every 3 months on day 30 of the month. Please share this page with friends and colleagues if you find it useful.
If you have any questions, please don’t hesitate to comment below.
If you are looking for cron jobs that run at certain minutes, hours, days, weekdays, or months, or if you are looking for miscellaneous cron jobs, then check out our relevant sections, or visit our cron job cheat sheet for a list of hundreds of popular cron jobs.