The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 21 * * *
This cron command translates to the following (in Human-Readable format):
“Every 1 day at 9:30 pm.”
What is a Cron Job & Crontab?
A cron job is a task that is scheduled to run at a specified time or interval. Cron jobs are typically used to perform system maintenance or administration tasks, such as backing up data or generating reports.
The crontab is a file that contains instructions for the cron daemon. The crontab is typically edited using the crontab command.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 1 day at 9:30 pm“:
FUN FACT: Cron jobs are named after the Greek god of time, Chronos – so now you know where the name comes from!.
You might want to set up a crontab or cron job to run every 1 day at 9:30 pm for several reasons, including:
- Generate a report on website activity for the day and email it to the webmaster
- Run a script to backup the database
- Delete temporary files that are more than 30 days old
Similar Cron Jobs
You might also want to run a crontab:
FUN FACT: Cron jobs can be used to automate just about any task that needs to be performed regularly – so get creative and see what you can come up with!.
In this article, you learned how to set up a cron job that runs every 1 day at 9:30 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.