The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 19 */4 * *
This cron command translates to the following (in Human-Readable format):
“Every 4 days at 7:00 pm.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. These jobs are usually used for maintenance or automation purposes. For example, a cron job could be set to delete temporary files every week so that they don’t take up space on the server.
A crontab is a file containing commands and instructions for the cron daemon to execute. The crontab is used to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 4 days at 7:00 pm“:
FUN FACT: If you want to see what commands are scheduled in your crontab, type: “crontab -l”.
You might want to set up a crontab or cron job to run every 4 days at 7:00 pm for several reasons, including:
- A cron job to update a user’s profile picture from their social media account
- A cron job to send out a daily digest of new content from subscribed websites
- A cron job to check for new software updates and notify the user
- A cron job to calculate how much money the user has spent in the last month and notify them
Similar Cron Jobs
You might also want to run a crontab:
- every 7 days
- every 2 days
- every 1 day
- every 4 days
- every 8 days
- every 6 days
- every 7 days at 7:30 am
- every 8 days at 12:00 pm
FUN FACT: Cron jobs are automated processes that run on a schedule..
In this article, you learned how to set up a cron job that runs every 4 days at 7:00 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.