The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 17 */3 * *
This cron command translates to the following (in Human-Readable format):
“Every 3 days at 5:30 pm.”
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.
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 5:30 pm“:
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 5:30 pm for several reasons, including:
- A daily backup that needs to happen every three days
- A cron job that sends out a reminder email every three days
- A cron job that checks for updates to a software every three days
Similar Cron Jobs
You might also want to run a crontab:
FUN FACT: You can use cron to schedule just about anything!.
In this article, you learned how to set up a cron job that runs every 3 days at 5:30 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 cron job cheat sheet for a list of hundreds of popular cron jobs.