Cron Job Every 4 Months On Day 20 Of The Month (Crontab)

This page will help you quickly and easily set up a cron job to run every 4 months on day 20 of the month.

The Cron Job/Crontab

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

0 0 20 */4 *

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

“Every 4 months on day 20 of the month.”

What is a Cron Job & Crontab?

A cron job is a time-based task that is set to run at specific intervals. This can be anything from running a script every hour to backing up a database every day. Cron jobs are typically used for maintenance or automation purposes.

Crontab files are typically stored in the /etc/crontab file, but they can also be stored in individual user’s home directories. To edit your own crontab file, you can use the command “crontab -e”. This will open up the file in your default text editor.

Cron Fields

Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 months on day 20 of the month“:

  • Field 1: (0) indicates that the task will be run at minute 0.
  • Field 2: (0) indicates that the task will be run at hour 0 (12 am).
  • Field 3: (20) indicates that the task will be run on day 20 of every month.
  • Field 4: (*/4) indicates that the task will be run every 4 months.
  • Field 5: (*) indicates that the task will be run every day of the week.
  •  

    FUN FACT: If you want to see what commands are scheduled in your crontab, type: “crontab -l”.

    Use Cases

    You might want to set up a crontab or cron job to run every 4 months on day 20 of the month for several reasons, including:

    • To run a script every 4 months on day 20 to check for updates
    • To run a backup every 4 months on day 20
    • To send out an email reminder every 4 months on day 20

    Similar Cron Jobs

    You might also want to run a crontab:

    FUN FACT: Cron jobs are named after the Greek god Chronos, who represents time itself..

    Wrapping Up

    In this article, you learned how to set up a cron job that runs every 4 months on day 20 of the month. 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.

    SHARE:

    Leave a Comment