The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 20-21 * * *
This cron command translates to the following (in Human-Readable format):
“Every hour between 8:00 pm and 9:00 pm.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at a specific interval. For example, a cron job can be set to run every day at midnight in order to update a database or send out nightly emails. Cron jobs are typically used for maintenance tasks that need to be performed on a regular basis.
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 hour between 8:00 pm and 9:00 pm“:
FUN FACT: One common use for cron jobs is to send out email reminders or notifications based on certain events (such as an upcoming deadline)..
You might want to set up a crontab or cron job to run every hour between 8:00 pm and 9:00 pm for several reasons, including:
- Running a backup of all files on the server
- Generating a report of server activity for the past day
- Checking for updates to installed software and installing them
- Scheduling maintenance tasks like defragmenting the hard drive
Similar Cron Jobs
You might also want to run a crontab:
- every 3 hours
- every 4 hours
- every 11 hours
- every 10 hours
- every 2 hours
- every hour between 12:00 am and 6:00 pm
- every hour between 6:00 am and 11:00 pm
- every hour between 2:00 am and 11:00 pm
FUN FACT: Cron jobs are automated processes that run on a schedule..
In this article, you learned how to set up a cron job that runs every hour between 8:00 pm and 9:00 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.