Cron Job Every 2 Months On Day 21 Of The Month (Crontab)

This page will help you quickly and easily set up a cron job to run every 2 months on day 21 of the month.

The Cron Job/Crontab

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

0 0 21 */2 *

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

“Every 2 months on day 21 of the month.”

What is a Cron Job & Crontab?

A cron job is a scheduled task that is typically executed by the operating system. Cron jobs are often used to automate repetitive tasks, such as backing up files or checking for updates.

The crontab is a file that contains instructions for the cron daemon. The crontab is typically edited using the crontab command.

Cron Fields

Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 2 months on day 21 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: (21) indicates that the task will be run on day 21 of every month.

Field 4: (*/2) indicates that the task will be run every 2 months.

Field 5: (*) indicates that the task will be run every day of the week.

 

FUN FACT: Cron is one of the most versatile tools in a Linux administrator’s toolbox..

Use Cases

You might want to set up a crontab or cron job to run every 2 months on day 21 of the month for several reasons, including:

• Automatically send a monthly report on the 21st day of every other month
• Generate a monthly sales report on the 21st day of every other month
• Run a script to update a database on the 21st day of every other month

Similar Cron Jobs

You might also want to run a crontab:

• every 1 month
• every 6 months
• every 4 months
• every 2 months
• every 3 months
• every 4 months on day 11 of the month
• every 4 months on day 9 of the month
• every 5 months on day 18 of the month

FUN FACT: Cron jobs are used to schedule commands or scripts to run automatically at a specified time and date..

Wrapping Up

In this article, you learned how to set up a cron job that runs every 2 months on day 21 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.