The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 7 */3 * *
This cron command translates to the following (in Human-Readable format):
“Every 3 days at 7:30 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 emails.
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 3 days at 7:30 am“:
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)..
You might want to set up a crontab or cron job to run every 3 days at 7:30 am for several reasons, including:
- notify users of upcoming event
- send out a weekly newsletter
- generate a report on user activity
- back up the database
Similar Cron Jobs
You might also want to run a crontab:
- every 2 days
- every 6 days
- every 3 days
- every 9 days
- every 9 days at 5:30 am
- every 8 days at 12:00 pm
- every 1 day at 1:00 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!.
In this article, you learned how to set up a cron job that runs every 3 days at 7:30 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.