The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 17-21 * * *
This cron command translates to the following (in Human-Readable format):
“Every hour between 5:00 pm 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 table or list of commands that are scheduled to run at specified times. The commands in a crontab file (also called a “cron table”) are normally executed by the cron daemon, which runs in the background and executes these commands automatically.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every hour between 5:00 pm and 9:00 pm“:
FUN FACT: If you want to edit your personal crontab, just type: “crontab -e” at the command prompt..
You might want to set up a crontab or cron job to run every hour between 5:00 pm and 9:00 pm for several reasons, including:
- Sending a daily report to the boss at 5:00 pm
- Running a backup of the database at 6:00 pm
- Generating an analytics report at 7:00 pm
- Clearing the cache at 8:00 pm
Similar Cron Jobs
You might also want to run a crontab:
- every 11 hours
- every 9 hours
- every 6 hours
- every 1 hour
- every hour between 8:00 am and 11:00 am
- every 12 hours at 1 minutes past the hour
- every hour between 2:00 am and 5:00 am
FUN FACT: The most common way to edit cron jobs is using the crontab command – this stands for “cron table,” and it contains all the information about when your tasks should be executed..
In this article, you learned how to set up a cron job that runs every hour between 5:00 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.