The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 20 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 8:00 pm.”
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.
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 8:00 pm“:
FUN FACT: When editing your crontab, it is important to use a text editor that supports Unix-style line endings (LF), as opposed to Windows-style line endings (CRLF)..
You might want to set up a crontab or cron job to run every 4 days at 8:00 pm for several reasons, including:
- To send a daily summary email to all users
- To update a user’s profile information
- To calculate statistics for the past 4 days
- To delete temporary files that are more than 4 days old
Similar Cron Jobs
You might also want to run a crontab:
- every 8 days
- every 6 days
- every 5 days
- every 10 days
- every 9 days
- every 6 days at 11:00 am
- every 5 days at 2:00 pm
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 4 days at 8:00 pm. 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.