The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 4 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 4:30 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at a specific interval. For example, a cron job could be set to run every day at midnight in order to update a database or send out nightly emails. Cron jobs are typically used for maintenance tasks that need to be performed regularly.
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 4:30 am“:
FUN FACT: If a cron job is not properly configured, it might never execute – so make sure you double-check your settings before setting one up!.
You might want to set up a crontab or cron job to run every 4 days at 4:30 am for several reasons, including:
- Sending a daily digest email to all users
- Generating a report of yesterday’s sales
- Backing up the database
- Clearing the cache
Similar Cron Jobs
You might also want to run a crontab:
- every 4 days
- every 1 day
- every 9 days
- every 8 days
- every 3 days
- every 1 day at 6:00 pm
- every 10 days at 7:30 am
FUN FACT: Cron jobs can be set up to run at specific times, or they can be configured to run periodically (e.g., every hour)..
In this article, you learned how to set up a cron job that runs every 4 days at 4:30 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 cron job cheat sheet for a list of hundreds of popular cron jobs.