Course 149 - Fall 1997
                Assignment 4

   Find out what crontab is good for, and how it works. One edits the
personal crontab file with the command
        crontab -e
Use crontab to check, every morning at 4:12 AM, which people are logged in.
Save the login data in a file so that you can check the login records at a
later time.
   Email your crontab file to me on any day between 3 AM and 5 AM, but no
later than the due date. Include auxiliary files if needed. You must use
crontab itself to do this late-night email.

   Due date: 5 December 1997.