Cron Job Every 3 Days At 10:30 am (Crontab)

This page will help you quickly and easily set up a cron job to run every 3 days at 10:30 am.

The Cron Job/Crontab

To have your task run at this frequency, use the following cron:

30 10 */3 * *

This cron command translates to the following (in Human-Readable format):

“Every 3 days at 10:30 am.”

What is a Cron Job & Crontab?

In computing, a cron job is a time-based task that is set to run at certain predetermined times or intervals. A cron job can be used to schedule anything from basic tasks like running backups to more complex tasks like sending out email alerts or syncing files between servers. Cron jobs are typically used for maintenance or administrative tasks that need to be performed on a regular basis.

A crontab is a table or list of commands that are scheduled to run at specified times. The commands in a crontab file (also called a “cron table”) are normally executed by the cron daemon, which runs in the background and executes these commands automatically.

Cron Fields

Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 days at 10:30 am“:

  • Field 1: (30) indicates that the task will be run at minute 30.
  • Field 2: (10) indicates that the task will be run at hour 10 (10 am).
  • Field 3: (*/3) indicates that the task will be run every 3 days.
  • Field 4: (*) indicates that the task will be run every month.
  • Field 5: (*) indicates that the task will be run every day of the week.
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    FUN FACT: When editing your crontab, it is important to use a text editor that supports Unix-style line endings (LF), as opposed to Windows-style line endings (CRLF)..

    Use Cases

    You might want to set up a crontab or cron job to run every 3 days at 10:30 am for several reasons, including:

    • Updating a blog
    • Backing up files
    • Checking for system updates
    • Generating reports

    Similar Cron Jobs

    You might also want to run a crontab:

    FUN FACT: One common use for cron jobs is to send out email reminders or notifications based on certain events (such as an upcoming deadline)..

    Wrapping Up

    In this article, you learned how to set up a cron job that runs every 3 days at 10:30 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.

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