The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
1 */12 * * *
This cron command translates to the following (in Human-Readable format):
“Every 12 hours at 1 minutes past the hour.”
What is a Cron Job & Crontab?
A cron job is a scheduled task that is typically executed automatically at a predetermined time or interval. Cron jobs are often used to perform routine system maintenance tasks, such as backing up files or databases, deleting temporary files, or sending email notifications.
Crontab files are stored in the “/etc/cron*” directories on most Linux systems. Each user has their own crontab file, and there is also a system-wide crontab file that can be used to schedule system tasks.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 12 hours at 1 minutes past the hour“:
FUN FACT: Each user on a system can have their own crontab, and commands in them will be executed as that user..
You might want to set up a crontab or cron job to run every 12 hours at 1 minutes past the hour for several reasons, including:
- Run a backup script
- Clear caches
- Update search indexes
- Send out email newsletters
- Generate reports
Similar Cron Jobs
You might also want to run a crontab:
- every 2 hours
- every 12 hours
- every 10 hours
- every 8 hours
- every hour between 3:00 am and 12:00 pm
- every hour between 4:00 pm and 8:00 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 12 hours at 1 minutes past the hour. 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.