The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 1 */3 * *
This cron command translates to the following (in Human-Readable format):
“Every 3 days at 1:00 am.”
What is a Cron Job & Crontab?
A cron job is a Linux utility used for scheduling the execution of commands or scripts at a specified time and date. Cron is typically used for system maintenance or administration, such as running backups or log rotation.
To create or edit a cron job, users must first open the crontab file using a text editor. The crontab file contains instructions for the cron daemon, which is the program that actually executes the commands specified in the file. Each line in the crontab file represents a single task or command.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 days at 1:00 am“:
FUN FACT: When configuring a cron job, you can specify the minute, hour, day of the month, month and day of the week when it should run – this gives you a lot of flexibility in terms of when your task will be performed automatically!.
You might want to set up a crontab or cron job to run every 3 days at 1:00 am for several reasons, including:
- To run a script that clears the cache every 3 days
- To send out an email reminder to renew a subscription every 3 days
- To take a backup of the database every 3 days
Similar Cron Jobs
You might also want to run a crontab:
- every 8 days
- every 7 days
- every 4 days
- every 3 days
- every 9 days
- every 1 day
- every 9 days at 8:30 pm
- every 5 days at 7:30 am
- every 7 days at 3:00 pm
FUN FACT: Cron jobs are named after the Greek god Chronos, who represents time itself..
In this article, you learned how to set up a cron job that runs every 3 days at 1:00 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.