The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 9 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 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 typically used for automating tasks, such as running backups or sending emails.
Crontab is a file that contains commands and instructions for the cron daemon to execute. The crontab file is usually located in the /etc/cron directory. Each user on a system can have their own crontab file. The commands in the crontab files are executed by the cron daemon at the specified times.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 9:00 am“:
FUN FACT: You can use cron to schedule just about anything!.
You might want to set up a crontab or cron job to run every 4 days at 9:00 am for several reasons, including:
- Automatically generating reports
- Running a daily backup
- Checking for system updates
- Sending out reminder emails
Similar Cron Jobs
You might also want to run a crontab:
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)..
In this article, you learned how to set up a cron job that runs every 4 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.