The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 9 */8 * *
This cron command translates to the following (in Human-Readable format):
“Every 8 days at 9:30 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 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 consists of a series of lines, each of which represents a task to be executed. Each line has five fields, separated by spaces or tabs.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 8 days at 9:30 am“:
FUN FACT: If you want to see what commands are scheduled in your crontab, type: “crontab -l”.
You might want to set up a crontab or cron job to run every 8 days at 9:30 am for several reasons, including:
- Checking for updates to a software package
- Deleting temporary files that are no longer needed
- Sending out a daily digest of new content from a website
Similar Cron Jobs
You might also want to run a crontab:
- every 2 days
- every 1 day
- every 10 days
- every 8 days
- every 9 days
- every 3 days
- every 2 days at 1:00 am
- every 4 days at 4:30 pm
FUN FACT: When troubleshooting issues with cron jobs, it can be helpful to run them manually from the command line – this will allow you to see any error messages that might be generated..
In this article, you learned how to set up a cron job that runs every 8 days at 9:30 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.