The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 0 9 */4 *
This cron command translates to the following (in Human-Readable format):
“Every 4 months on day 9 of the month.”
What is a Cron Job & Crontab?
A cron job is a task that is scheduled to run at a specific 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. The crontab is used to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.
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 9 of the month“:
FUN FACT: Cron jobs can be used to automate just about any task that needs to be performed regularly – so get creative and see what you can come up with!.
You might want to set up a crontab or cron job to run every 4 months on day 9 of the month for several reasons, including:
- Backup a database
- Generate reports
- Sync data between servers
- Send out monthly newsletters
- Update software
Similar Cron Jobs
You might also want to run a crontab:
- every 6 months
- every 2 months
- every 4 months
- every 3 months
- every 5 months
- every 1 month
- every 4 months on day 3 of the month
- every 4 months on day 22 of the month
- every 2 months on day 8 of the month
FUN FACT: If you need to temporarily disable a cron job, you can simply comment out the line in the crontab file that corresponds to that particular task..
In this article, you learned how to set up a cron job that runs every 4 months on day 9 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 crontab cheat sheet for a list of hundreds of popular cron jobs.