The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
* 4-21 * * *
This cron command translates to the following (in Human-Readable format):
“Every minute between 4:00 am and 9:00 pm.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. These jobs are usually used for maintenance or automation purposes. For example, a cron job could be set to delete temporary files every week so that they don’t take up space on the server.
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 minute between 4:00 am and 9:00 pm“:
FUN FACT: When troubleshooting issues with cron jobs, it can be helpful to run them manually from the command line – this will allow you to see any error messages that might be generated..
You might want to set up a crontab or cron job to run every minute between 4:00 am and 9:00 pm for several reasons, including:
- A cron job which runs every minute between 4:00 am and 9:00 pm can be used to check for new emails every hour.
- A cron job which runs every minute between 4:00 am and 9:00 pm can be used to check for new tweets every hour.
- A cron job which runs every minute between 4:00 am and 9:00 pm can be used to check for new Facebook posts every hour.
Similar Cron Jobs
You might also want to run a crontab:
- every 7 minutes
- every 5 minutes
- every 4 minutes
- every 26 minutes
- every 11 minutes
- every 2 minutes
- every minute between 6:00 am and 10:00 pm
- every minute between 7:00 am and 9:00 am
FUN FACT: Cron jobs are named after the Greek god Chronos, who represents time itself..
In this article, you learned how to set up a cron job that runs every minute between 4:00 am 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.