The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 12 */9 * *
This cron command translates to the following (in Human-Readable format):
“Every 9 days at 12:00 pm.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at a specific interval. For example, a cron job can be set to run every day at midnight in order to update a database or send out nightly emails. Cron jobs are typically used for maintenance tasks that need to be performed on a regular basis.
Crontab files are stored in the “/etc/cron*” directories on most Linux systems. Each user has their own crontab file, and there is also a system-wide crontab file that can be used to schedule system tasks.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 9 days at 12:00 pm“:
FUN FACT: Cron jobs are used to schedule commands or scripts to run automatically at a specified time and date..
You might want to set up a crontab or cron job to run every 9 days at 12:00 pm for several reasons, including:
- A daily backup that needs to be stored for 9 days
- A cron job that runs a system update every 9 days
- A cron job that emails the system administrator every 9 days
Similar Cron Jobs
You might also want to run a crontab:
- every 5 days
- every 10 days
- every 7 days
- every 8 days
- every 3 days at 4:00 am
- every 9 days at 2:30 pm
- every 7 days at 7:00 pm
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 9 days at 12:00 pm. 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.