Cron Setup

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Author:	Joey
Created On:	September 19th, 2003
Updated On:	September 19th, 2003

Cron comes from the word chronos, the Greek word for time. Cron is a utility that can help with automating certain tasks in Linux. For example if you would like to create backups of certain files or directories each night while you are sleeping, you can use Cron to automate this.

Cron stores it's enteries in the crontab (cron table) file. This is generally located in your /etc directory. As well, each user on your system can have their own crontab which would be stored in /var/spool/cron/. To edit a users crontab entry, simply log into your system for that particular user and type crontab -e. The default editor for the 'crontab -e' command is vi. If you are not familiar with VI you can change the default editor by running the following command export VISUAL='editor'. Of course you must replace editor with your favorite text editor (nano, pico, joe etc). Or you could always learn how to use VI ;)

Below are 2 entries in my /etc/crontab file. The first one is used to back up my /etc directory nightly. The second entry is to run the Analog program to calculate the web server stats for linuxhelp.ca.

12 3 * * * root tar czf /usr/local/backups/daily/etc.tar.gz /etc >> /dev/null 2>