The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 18-21 * * *
This cron command translates to the following (in Human-Readable format):
“Every hour between 6:00 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 time or interval. These jobs are usually used for automating tasks, such as running backups or sending emails. Cron is the name of the program that enables users to schedule these jobs.
Crontab files are stored in the “/etc/cron*” directories on most Linux systems. Each user has their own crontab file, and there is also a system-wide crontab file that can be used to schedule system tasks.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every hour between 6:00 pm and 9:00 pm“:
FUN FACT: Cron jobs are used to schedule commands or scripts to run automatically at a specified time and date..
You might want to set up a crontab or cron job to run every hour between 6:00 pm and 9:00 pm for several reasons, including:
- Turning lights on/off at sunset/sunrise
- Automatic watering of plants
- Checking for new emails every hour
- Downloading updates for anti-virus software
- Running a backup of important files
Similar Cron Jobs
You might also want to run a crontab:
- every 9 hours
- every 4 hours
- every 8 hours
- every 11 hours
- every 1 hour
- every 2 hours
- every hour between 12:00 pm and 6:00 pm
- every hour between 5:00 am and 1:00 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 hour between 6:00 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.