The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 2 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 2:30 am.”
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 automating tasks, such as running backups or sending emails.
A crontab is a file that contains a list of commands to be executed by the cron daemon. The commands in the crontab are executed at the specified times.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 2:30 am“:
FUN FACT: Cron is typically used for things like system maintenance tasks, running backups etc..
You might want to set up a crontab or cron job to run every 4 days at 2:30 am for several reasons, including:
- Sending a daily report on server performance
- Rotating log files
- Backing up databases
- Clearing temporary files
Similar Cron Jobs
You might also want to run a crontab:
- every 1 day
- every 10 days
- every 7 days
- every 6 days
- every 2 days
- every 1 day at 12:30 pm
- every 6 days at 11:00 am
- every 4 days at 10:30 pm
FUN FACT: If you want to edit your personal crontab, just type: “crontab -e” at the command prompt..
In this article, you learned how to set up a cron job that runs every 4 days at 2:30 am. 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.