The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
10 */9 * * *
This cron command translates to the following (in Human-Readable format):
“Every 9 hours at 10 minutes past the hour.”
What is a Cron Job & Crontab?
A cron job is a scheduled task that is typically executed by the operating system on a regular basis. Cron jobs are often used to perform maintenance or administrative tasks, such as backing up data or updating software.
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 9 hours at 10 minutes past the hour“:
FUN FACT: Each user on a system can have their own crontab, and commands in them will be executed as that user..
You might want to set up a crontab or cron job to run every 9 hours at 10 minutes past the hour for several reasons, including:
- Periodically check for updates to a software application
- Run a backup of files every 9 hours
- Send out an email notification every 9 hours
- Refresh data from an external API every 9 hours
Similar Cron Jobs
You might also want to run a crontab:
- every 9 hours
- every 2 hours
- every 10 hours
- every 8 hours
- every 5 hours
- every 7 hours
- every hour between 10:00 am and 8:00 pm
- every hour between 12:00 am and 3:00 am
FUN FACT: If you want to see what commands are scheduled in your crontab, type: “crontab -l”.
In this article, you learned how to set up a cron job that runs every 9 hours at 10 minutes past the hour. 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.