The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 9 */9 * *
This cron command translates to the following (in Human-Readable format):
“Every 9 days at 9:00 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. This can be anything from running a script every hour to backing up a database every day. Cron jobs are typically used for maintenance tasks or tasks that need to be performed regularly, such as checking for updates or sending out reports.
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 9 days at 9:00 am“:
FUN FACT: Cron is typically used for things like system maintenance tasks, running backups etc..
You might want to set up a crontab or cron job to run every 9 days at 9:00 am for several reasons, including:
- Checking for updates to a software package
- Sending out a report or notification
- Triggering a backup
- Running a system maintenance task
Similar Cron Jobs
You might also want to run a crontab:
- every 2 days
- every 3 days
- every 5 days
- every 4 days
- every 8 days
- every 1 day at 5:00 am
- every 8 days at 2:00 am
FUN FACT: If you want to edit your personal crontab, just type: “crontab -e” at the command prompt..
In this article, you learned how to set up a cron job that runs every 9 days at 9:00 am. 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.