The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 0 19 */4 *
This cron command translates to the following (in Human-Readable format):
“Every 4 months on day 19 of the month.”
What is a Cron Job & Crontab?
A cron job is a Linux utility used for scheduling the execution of commands or scripts at a specified time and date. Cron is typically used for system maintenance or administration, such as running backups or log rotation.
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 4 months on day 19 of the month“:
FUN FACT: A common use for cron jobs is to generate periodic reports – for example, you could set up a cron job to automatically generate and send out a report on website traffic statistics every week..
You might want to set up a crontab or cron job to run every 4 months on day 19 of the month for several reasons, including:
- Checking for updates to a software package and installing the updates
- Sending out a monthly newsletter
- Generating reports on web traffic statistics
- Processing payroll
Similar Cron Jobs
You might also want to run a crontab:
- every 5 months
- every 3 months
- every 2 months
- every 1 month
- every 6 months
- every 4 months
- every 5 months on day 22 of the month
- every 2 months on day 9 of the month
FUN FACT: When editing your crontab, it is important to use a text editor that supports Unix-style line endings (LF), as opposed to Windows-style line endings (CRLF)..
In this article, you learned how to set up a cron job that runs every 4 months on day 19 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.