The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
* 1-21 * * *
This cron command translates to the following (in Human-Readable format):
“Every minute between 1:00 am and 9:00 pm.”
What is a Cron Job & Crontab?
A cron job is a task that is scheduled to run at a specific time or interval. Cron is a Linux utility that enables users to schedule tasks to be executed automatically at a specified time or interval. A cron job is typically used to automate system maintenance or administration tasks, such as running backups or sending emails.
A crontab is a file containing commands and instructions for the cron daemon to execute. The crontab is used to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every minute between 1:00 am 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 minute between 1:00 am and 9:00 pm for several reasons, including:
- Check for updates to a software package
- Run a backup script
- Perform maintenance tasks on a database
- Generate reports
- Send out email notifications
Similar Cron Jobs
You might also want to run a crontab:
- every 13 minutes
- every 27 minutes
- every 23 minutes
- every 30 minutes
- every minute between 4:00 am and 9:00 pm
- every minute between 5:00 am and 11:00 pm
FUN FACT: Each user on a system can have their own crontab, and commands in them will be executed as that user..
In this article, you learned how to set up a cron job that runs every minute between 1:00 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 crontab cheat sheet for a list of hundreds of popular cron jobs.