The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 16 */3 * *
This cron command translates to the following (in Human-Readable format):
“Every 3 days at 4:00 pm.”
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.
A crontab is a file that contains commands to be run at specified times. The crontab file is typically edited using the crontab command, which can be used to list, edit, or delete the contents of the file.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 days at 4:00 pm“:
FUN FACT: Cron is one of the most powerful tools available on a Linux system – use it wisely!.
You might want to set up a crontab or cron job to run every 3 days at 4:00 pm for several reasons, including:
- Checking for updates to a software package
- Deleting temporary files that are no longer needed
- Running a backup of important files
Similar Cron Jobs
You might also want to run a crontab:
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 days at 4:00 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.