Cron

An overview of using Ubuntu's built in Cron system.

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Edit Cron

sudo nano /etc/crontab

Auto Update & Upgrade & Reboot/Restart

22 2    * * *   root /usr/bin/apt update -q -y >> /var/log/apt/automaticupdates.log
33 3    * * *   root /usr/bin/apt upgrade -q -y >> /var/log/apt/automaticupdates.log
44 4    * * *   root reboot

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Advanced Configs

Below is a template/guide to creating your own crontab scripts!

Templates

[minute] [hour] [day_of_month] [month] [day_of_week] [user] [command_to_run]
* * * * * root /root/update.sh

Field	Values allowed
Minute	0 to 59
Hour	0 to 23
Day of month	1 to 31
Month	1 to 12 OR JAN to DEC
Day of week	0 to 6 OR SUN to SAT

Special Syntax	Regular equivalent
@hourly	0 * * * *
@daily	0 0 * * *
@weekly	0 0 * * 0
@monthly	0 0 1 * *
@yearly	0 0 1 1 *