Cron Job Every 9 Hours At 40 Minutes Past The Hour (Crontab)

This page will help you quickly and easily set up a cron job to run every 9 hours at 40 minutes past the hour.

The Cron Job/Crontab

To have your task run at this frequency, use the following cron:

40 */9 * * *

This cron command translates to the following (in Human-Readable format):

“Every 9 hours at 40 minutes past the hour.”

What is a Cron Job & Crontab?

A cron job is a task that is scheduled to run at a specific time or interval. Cron jobs are typically used for maintenance tasks, such as backing up data or updating software.

Crontab is a file that contains commands and instructions for the cron daemon to execute. The crontab file is usually located in the /etc/cron directory. Each user on a system can have their own crontab file. The commands in the crontab files are executed by the cron daemon at the specified times.

Cron Fields

Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 9 hours at 40 minutes past the hour“:

  • Field 1: (40) indicates that the task will be run at minute 40.
  • Field 2: (*/9) indicates that the task will be run every 9 hours.
  • Field 3: (*) indicates that the task will be run every day of the month.
  • Field 4: (*) indicates that the task will be run every month.
  • Field 5: (*) indicates that the task will be run every day of the week.
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    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!.

    Use Cases

    You might want to set up a crontab or cron job to run every 9 hours at 40 minutes past the hour for several reasons, including:

    • Running a backup of a database
    • Checking for updates to software dependencies
    • Clearing out old log files
    • Sending out nightly emails

    Similar Cron Jobs

    You might also want to run a crontab:

    FUN FACT: Each user on a system can have their own crontab, and commands in them will be executed as that user..

    Wrapping Up

    In this article, you learned how to set up a cron job that runs every 9 hours at 40 minutes past the hour. 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.

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