The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 15-19 * * *
This cron command translates to the following (in Human-Readable format):
“Every hour between 3:00 pm and 7:00 pm.”
What is a Cron Job & Crontab?
A cron job is a Linux utility used for scheduling the execution of commands or scripts at a specified time and date. Cron is typically used for system maintenance or administration, such as running backups or log rotation.
A crontab is a text file that contains a list of commands to be run at specified times. The commands in the crontab are executed by the cron daemon, which runs on most Unix-like systems.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every hour between 3:00 pm and 7:00 pm“:
FUN FACT: When configuring a cron job, you can specify the minute, hour, day of the month, month and day of the week when it should run – this gives you a lot of flexibility in terms of when your task will be performed automatically!.
You might want to set up a crontab or cron job to run every hour between 3:00 pm and 7:00 pm for several reasons, including:
- Run a backup of the database every day at 3:00 pm
- Generate a report of website usage statistics every day at 4:00 pm
- Send out a daily email newsletter to subscribers at 5:00 pm
- Delete all temporary files older than 7 days at 6:00 pm
Similar Cron Jobs
You might also want to run a crontab:
- every 3 hours
- every 1 hour
- every 6 hours
- every 2 hours
- every 5 hours
- every hour between 2:00 am and 7:00 pm
- every 2 hours at 20 minutes past the hour
- every 2 hours at 30 minutes past the hour
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)..
In this article, you learned how to set up a cron job that runs every hour between 3:00 pm and 7:00 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.