The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 3 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 3:00 am.”
What is a Cron Job & Crontab?
A crontab is a file that contains commands to be run at specified times. The crontab file is typically edited using the crontab command, which can be used to list, edit, or delete the contents of the file.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 3:00 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 4 days at 3:00 am for several reasons, including:
- Automatically generate a report and send it via email
- Backup files to an external drive
- Refresh data from an external API
- Run a maintenance script
Similar Cron Jobs
You might also want to run a crontab:
FUN FACT: When troubleshooting issues with cron jobs, it can be helpful to run them manually from the command line – this will allow you to see any error messages that might be generated..
In this article, you learned how to set up a cron job that runs every 4 days at 3:00 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.