The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 11 */3 * *
This cron command translates to the following (in Human-Readable format):
“Every 3 days at 11:30 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. This can be anything from running a backup script every night to sending out an email notification once a week. Cron jobs are typically used for maintenance or repetitive tasks.
A crontab is a file that contains instructions for the cron daemon. The cron daemon is a program that runs in the background and executes tasks at specified times. A crontab file typically contains a list of commands, with each command being executed at a specified time.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 days at 11:30 am“:
FUN FACT: A common use for cron jobs is to generate periodic reports – for example, you could set up a cron job to automatically generate and send out a report on website traffic statistics every week..
You might want to set up a crontab or cron job to run every 3 days at 11:30 am for several reasons, including:
- Automatically sending out a report or notification every 3 days
- Updating a remote server with new data every 3 days
- Backing up files to another system every 3 days
Similar Cron Jobs
You might also want to run a crontab:
- every 6 days
- every 10 days
- every 9 days
- every 2 days
- every 3 days
- every 5 days
- every 4 days at 9:30 pm
- every 7 days at 5:00 am
- every 7 days at 6:00 pm
FUN FACT: The most common way to edit cron jobs is using the crontab command – this stands for “cron table,” and it contains all the information about when your tasks should be executed..
In this article, you learned how to set up a cron job that runs every 3 days at 11:30 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.