The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 21 */2 * *
This cron command translates to the following (in Human-Readable format):
“Every 2 days at 9:00 pm.”
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.
A crontab is a file that contains instructions for the cron daemon. The cron daemon is a program that runs in the background and executes tasks at specified times. A crontab file typically contains a list of commands, with each command being executed at a specified time.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 2 days at 9:00 pm“:
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 2 days at 9:00 pm for several reasons, including:
- A daily backup that is run every other day
- A script to check for updates that is run every other day
- A cron job to clean up temporary files that is run every other day
Similar Cron Jobs
You might also want to run a crontab:
- every 5 days
- every 4 days
- every 2 days
- every 7 days
- every 9 days
- every 8 days
- every 9 days at 5:00 am
- every 8 days at 12:00 am
FUN FACT: Cron is typically used for things like system maintenance tasks, running backups etc..
In this article, you learned how to set up a cron job that runs every 2 days at 9:00 pm. 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.