Cron Job Every 4 Days At 4:00 pm (Crontab)

This page will help you quickly and easily set up a cron job to run every 4 days at 4:00 pm.

The Cron Job/Crontab

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

0 16 */4 * *

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

“Every 4 days at 4:00 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 automating system maintenance or administration tasks, such as running backups or sending email reports.

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.

Cron Fields

Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 4:00 pm“:

  • Field 1: (0) indicates that the task will be run at minute 0.
  • Field 2: (16) indicates that the task will be run at hour 16 (4 pm).
  • Field 3: (*/4) indicates that the task will be run every 4 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: If you want to edit your personal crontab, just type: “crontab -e” at the command prompt..

    Use Cases

    You might want to set up a crontab or cron job to run every 4 days at 4:00 pm for several reasons, including:

    • Checking for updates to a software package
    • Sending out a reminder email
    • Generating a report

    Similar Cron Jobs

    You might also want to run a crontab:

    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!.

    Wrapping Up

    In this article, you learned how to set up a cron job that runs every 4 days at 4:00 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 crontab cheat sheet for a list of hundreds of popular cron jobs.

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