The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
1 */9 * * *
This cron command translates to the following (in Human-Readable format):
“Every 9 hours at 1 minutes past the hour.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is typically set up to run automatically at regular intervals. For example, a cron job might be used to send out a daily email report or to back up files every night.
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 hours at 1 minutes past the hour“:
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..
You might want to set up a crontab or cron job to run every 9 hours at 1 minutes past the hour for several reasons, including:
- Scheduling a regular database backup
- Checking for new software updates
- Sending out a daily email report
- Generating monthly statistics
- Triggering a nightly build
Similar Cron Jobs
You might also want to run a crontab:
- every 1 hour
- every 6 hours
- every 7 hours
- every 3 hours
- every hour between 11:00 am and 11:00 pm
- every 1 hour at 50 minutes past the hour
- every hour between 4:00 am and 5:00 pm
FUN FACT: If you need to delete a cron job, simply remove the corresponding line from the crontab file and save your changes..
In this article, you learned how to set up a cron job that runs every 9 hours at 1 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.