The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 0 */9 * *
This cron command translates to the following (in Human-Readable format):
“Every 9 days at 12:30 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.
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 9 days at 12:30 am“:
FUN FACT: Cron jobs can be set up to run at specific times, or they can be configured to run periodically (e.g., every hour)..
You might want to set up a crontab or cron job to run every 9 days at 12:30 am for several reasons, including:
- A daily backup that needs to run every 9 days
- A cron job that checks for updates to a software package and installs them if they exist
- A script that sends out an email reminder every 9 days
Similar Cron Jobs
You might also want to run a crontab:
- every 1 day
- every 2 days
- every 6 days
- every 4 days
- every 7 days at 2:30 am
- every 6 days at 5:00 am
- every 3 days at 9:00 pm
FUN FACT: If a cron job is not properly configured, it might never execute – so make sure you double-check your settings before setting one up!.
In this article, you learned how to set up a cron job that runs every 9 days at 12:30 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 cron job cheat sheet for a list of hundreds of popular cron jobs.