The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 9 */8 * *
This cron command translates to the following (in Human-Readable format):
“Every 8 days at 9:00 am.”
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 email reports.
A crontab is a table or list of commands that are scheduled to run at specified times. The commands in a crontab file (also called a “cron table”) are normally executed by the cron daemon, which runs in the background and executes these commands automatically.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 8 days at 9:00 am“:
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 8 days at 9:00 am for several reasons, including:
- Running a daily backup at 9:00 am every 8 days
- Checking for updates to a software package every 8 days at 9:00 am
- Sending out a reminder email every 8 days at 9:00 am
Similar Cron Jobs
You might also want to run a crontab:
- every 3 days
- every 8 days
- every 10 days
- every 6 days
- every 9 days
- every 2 days at 10:00 am
- every 5 days at 3:30 am
FUN FACT: When configuring a cron job, you can specify the minute, hour, day of the month, month and day of the week when it should run – this gives you a lot of flexibility in terms of when your task will be performed automatically!.
In this article, you learned how to set up a cron job that runs every 8 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 crontab cheat sheet for a list of hundreds of popular cron jobs.