The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 4 */3 * *
This cron command translates to the following (in Human-Readable format):
“Every 3 days at 4:00 am.”
What is a Cron Job & Crontab?
A cron job is a scheduled task that is typically executed automatically at a predetermined time or interval. Cron jobs are commonly used to perform system maintenance or administrative tasks, such as backing up data or generating reports.
A crontab is a file containing commands and instructions for the cron daemon to execute.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 days at 4:00 am“:
FUN FACT: Cron jobs are stored in a file called “crontab”, which is short for “cron table”..
You might want to set up a crontab or cron job to run every 3 days at 4:00 am for several reasons, including:
- To send out a monthly newsletter on the first of every month
- To run a daily backup at 4:00 am
- To generate reports every Monday morning
Similar Cron Jobs
You might also want to run a crontab:
- every 1 day
- every 6 days
- every 9 days
- every 5 days
- every 4 days
- every 2 days
- every 2 days at 7:00 pm
- every 3 days at 5:00 pm
FUN FACT: If you need to delete a cron job, simply remove the corresponding line from the crontab file and save your changes..
In this article, you learned how to set up a cron job that runs every 3 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 cron job cheat sheet for a list of hundreds of popular cron jobs.