crontab

Crontab File Example

Example of a crontab file:

*   *   *   *   *   /path_to_script_or_command
|   |   |   |   | 
|   |   |   |   weekday (0-6) (Sunday=0)
|   |   |   month (1-12)
|   |   day (0-31)
|   hour (0-23)
minute (0-59)

Crontab Tips:

Many versions of cron support the use of "*/n," which will run a command at every nth increment of time, instead of at nth time.  

For example:

*/5 * * * * getmail

This runs getmail every five minutes, not at the fifth
minute of every hour.

To disable email confirmation upon cronjob completion:

    
    >/dev/null 2>&1

    or

    &> /dev/null