The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
30 16 */7 * *
This cron command translates to the following (in Human-Readable format):
“Every 7 days at 4:30 pm.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at a specific interval. For example, a cron job can be set to run every day at midnight in order to update a database or send out nightly emails. Cron jobs are typically used for maintenance tasks that need to be performed on a regular basis.
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 7 days at 4:30 pm“:
FUN FACT: Cron jobs are used to schedule commands or scripts to run automatically at a specified time and date..
You might want to set up a crontab or cron job to run every 7 days at 4:30 pm for several reasons, including:
- Run a weekly backup of all user data on the system
- Send out a reminder email to all users that have not logged in for 7 days
- Purge any temporary files that are more than 7 days old
- Delete any user accounts that have been inactive for more than 7 days
Similar Cron Jobs
You might also want to run a crontab:
FUN FACT: If you want to edit your personal crontab, just type: “crontab -e” at the command prompt..
In this article, you learned how to set up a cron job that runs every 7 days at 4:30 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 crontab cheat sheet for a list of hundreds of popular cron jobs.