The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 4 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 4:00 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. These jobs are usually used for maintenance or automation purposes. For example, a cron job could be set to delete temporary files every week so that they don’t take up space on the server.
Crontab is a file that contains instructions for the cron daemon, which is a program that executes commands at specified intervals. Crontab files are typically edited with the crontab command, which allows users to create, edit, and delete their own crontab files.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 4:00 am“:
FUN FACT: Cron jobs are named after the Greek god Chronos, who represents time itself..
You might want to set up a crontab or cron job to run every 4 days at 4:00 am for several reasons, including:
- To run a system maintenance task that requires reboot every 4 days
- To send out a report every 4 days at 4:00 am
- To backup files every 4 days at 4:00 am
Similar Cron Jobs
You might also want to run a crontab:
- every 5 days
- every 9 days
- every 3 days
- every 8 days
- every 4 days
- every 8 days at 12:00 am
- every 5 days at 2:00 am
FUN FACT: If you want to edit your personal crontab, just type: “crontab -e” at the command prompt..
In this article, you learned how to set up a cron job that runs every 4 days at 4:00 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.