The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 12 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 12:30 pm.”
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 maintenance or administrative tasks, such as backing up data or updating software.
A 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. A crontab file consists of a series of lines, each of which represents a task to be executed. Each line has five fields, separated by spaces or tabs.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 12:30 pm“:
FUN FACT: Cron jobs are named after the Greek god Chronos, who represents time itself..
You might want to set up a crontab or cron job to run every 4 days at 12:30 pm for several reasons, including:
- To run a script that updates data in a database
- To send out email reminders
- To generate reports
- To backup files
Similar Cron Jobs
You might also want to run a crontab:
- every 4 days
- every 2 days
- every 3 days
- every 9 days
- every 6 days
- every 6 days at 10:00 am
- every 2 days at 8:30 am
- every 7 days at 11:30 pm
FUN FACT: If you need to temporarily disable a cron job, you can simply comment out the line in the crontab file that corresponds to that particular task..
In this article, you learned how to set up a cron job that runs every 4 days at 12:30 pm. 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.