The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 17 */8 * *
This cron command translates to the following (in Human-Readable format):
“Every 8 days at 5:30 pm.”
What is a Cron Job & Crontab?
A cron job is a scheduled task that is typically executed by the server in order to automate certain processes or tasks. For example, a cron job could be set up to automatically backup a database every night at 2am.
Crontab is a file that contains commands and instructions for the cron daemon to execute. The crontab file is usually located in the /etc/cron directory. Each user on a system can have their own crontab file. The commands in the crontab files are executed by the cron daemon at the specified times.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 8 days at 5:30 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..
You might want to set up a crontab or cron job to run every 8 days at 5:30 pm for several reasons, including:
- Scheduling a regular checkup for a car
- Sending out a weekly newsletter
- Making backups of important files
Similar Cron Jobs
You might also want to run a crontab:
- every 8 days
- every 1 day
- every 6 days
- every 4 days
- every 7 days
- every 8 days at 9:00 pm
- every 2 days at 6:00 am
- every 10 days at 4:00 pm
FUN FACT: Cron jobs are named after the Greek god of time, Chronos – so now you know where the name comes from!.
In this article, you learned how to set up a cron job that runs every 8 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.