The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 5 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 5:30 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. These jobs are usually used for maintenance or automation purposes. For example, a cron job could be set to delete temporary files every week so that they don’t take up space on the server.
A crontab is a text file containing a list of commands that are executed at specified times. The commands in the crontab are executed by the cron daemon, which runs in the background and checks for new entries every minute.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 5:30 am“:
FUN FACT: You can use cron to schedule just about anything!.
You might want to set up a crontab or cron job to run every 4 days at 5:30 am for several reasons, including:
- Sending a daily report on server usage statistics to the system administrator
- Backing up user data from the previous day
- Generating monthly financial reports
- Updating software installed on servers
- Running virus scans
Similar Cron Jobs
You might also want to run a crontab:
- every 8 days
- every 9 days
- every 1 day
- every 10 days
- every 3 days
- every 6 days at 1:30 am
- every 1 day at 1:00 am
- every 9 days at 11:30 pm
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 4 days at 5:30 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.