Hello Nicholas,   
      
   >> For a task to be run every 20 minutes I would simply use a crontab   
   >> line as:   
      
   >> */20 * * * * //>> You could for example use the cron line to run a backup of all your   
   >> user accounts at 5 a.m every week with:   
   >> 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/   
      
   > As you mention in your first crontab line, it is good practice to use the    
   > full path to the program or script in crontab. So your second line would    
   > be better with: /bin/tar, or /usr/bin/tar - even though tar is most likely   
   > in your system PATH settings.   
      
   Ironically, the first example is from what I use in my crontab and the second   
   example was taken from Crontab itself as in:   
      
   # Edit this file to introduce tasks to be run by cron.   
   #   
   # Each task to run has to be defined through a single line   
   # indicating with different fields when the task will be run   
   # and what command to run for the task   
   #   
   # To define the time you can provide concrete values for   
   # minute (m), hour (h), day of month (dom), month (mon),   
   # and day of week (dow) or use '*' in these fields (for 'any').#   
   # Notice that tasks will be started based on the cron's system   
   # daemon's notion of time and timezones.   
   #   
   # Output of the crontab jobs (including errors) is sent through   
   # email to the user the crontab file belongs to (unless redirected).   
   #   
   # For example, you can run a backup of all your user accounts   
   # at 5 a.m every week with:   
   # 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/   
      
   Jeff   
      
      
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