The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 0 20 */3 *
This cron command translates to the following (in Human-Readable format):
“Every 3 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 a specific time or interval. This can be used to automate tasks such as running backups, sending emails, or running system maintenance scripts.
A crontab (also known as a “cron table”) is a file that contains a list of commands that are executed at specified times.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 months on day 20 of the month“:
FUN FACT: Cron jobs are named after the Greek god Chronos, who represents time itself..
You might want to set up a crontab or cron job to run every 3 months on day 20 of the month for several reasons, including:
- To run a backup of all user data at the beginning of every quarter
- To generate reports on system usage at the end of every quarter
- To send out reminders to users about upcoming bills at the start of each new quarter
Similar Cron Jobs
You might also want to run a crontab:
- every 6 months
- every 2 months
- every 4 months
- every 5 months
- every 1 month on day 7 of the month
- every 5 months on day 23 of the month
FUN FACT: If you want to see what commands are scheduled in your crontab, type: “crontab -l”.
In this article, you learned how to set up a cron job that runs every 3 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 crontab cheat sheet for a list of hundreds of popular cron jobs.