ASSIGNMENT #2
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            Write a shell script called "track" which monitors the
            specified user's login and logout sessions. Every "pause"
            number of seconds, track scans the system and makes a note
            of who is currently logged on. If the specified user has
            logged on or off since the last scan, this information is
            displayed to standard output. Track operates until "count"
            scans have completed.


            usage: track -ncount -tpaues userid


            You might need the following utilities:

            who, grep, diff, sort, expr, cat, date, rm, mv, sleep.