The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 1 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 1:00 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at a specific time or interval. This can be used to automate tasks such as running backups, sending emails, or running system maintenance scripts.
Each user has their own crontab file, and the commands in this file are only executed by that particular user. The file contains instructions for the cron daemon. To edit your crontab file, you can use 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 days at 1:00 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 1:00 am for several reasons, including:
- Check for updates to a software package and download if available
- Rotate log files
- Delete temporary files older than X days
- Generate a report on system usage statistics
- Send out a reminder email for an upcoming event
Similar Cron Jobs
You might also want to run a crontab:
FUN FACT: When configuring a cron job, you can specify the minute, hour, day of the month, month and day of the week when it should run – this gives you a lot of flexibility in terms of when your task will be performed automatically!.
In this article, you learned how to set up a cron job that runs every 4 days at 1:00 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.