The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 9 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 9:30 am.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is typically set up to run automatically at regular intervals. For example, a cron job might be used to send out a daily email report or to back up files every night.
Crontab is a file that contains instructions for the cron daemon. The cron daemon is a program that runs in the background and executes tasks at specified times. The crontab file is used to specify which tasks are to be run and when they are to be run.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 9:30 am“:
FUN FACT: The most common way to edit cron jobs is using the crontab command – this stands for “cron table,” and it contains all the information about when your tasks should be executed..
You might want to set up a crontab or cron job to run every 4 days at 9:30 am for several reasons, including:
- Automatically backing up a database
- Generating reports
- Sending out notifications or updates
- Running a script or program
Similar Cron Jobs
You might also want to run a crontab:
- every 10 days
- every 9 days
- every 5 days
- every 4 days
- every 7 days
- every 3 days
- every 6 days at 7:00 am
- every 6 days at 1:00 pm
- every 9 days at 6:30 pm
FUN FACT: You can use cron to schedule just about anything!.
In this article, you learned how to set up a cron job that runs every 4 days at 9:30 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.