The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 0 15 */4 *
This cron command translates to the following (in Human-Readable format):
“Every 4 months on day 15 of the month.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. These jobs are usually used for maintenance or automation purposes. For example, a cron job could be set to delete temporary files every week so that they don’t take up space on the server.
A crontab is a file that contains a list of commands to be executed by the cron daemon. The commands in the crontab are executed at the specified times.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 months on day 15 of the month“:
FUN FACT: Cron is one of the most versatile tools in a Linux administrator’s toolbox..
You might want to set up a crontab or cron job to run every 4 months on day 15 of the month for several reasons, including:
- Generating monthly reports
- Sending out quarterly newsletters
- Checking for expiring subscriptions
- Backing up data
Similar Cron Jobs
You might also want to run a crontab:
- every 1 month
- every 4 months
- every 3 months
- every 2 months
- every 5 months
- every 1 month on day 15 of the month
- every 2 months on day 24 of the month
- every 4 months on day 31 of the month
FUN FACT: Cron jobs can be set up to run at specific times, or they can be configured to run periodically (e.g., every hour)..
In this article, you learned how to set up a cron job that runs every 4 months on day 15 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.