print <<EOUsage;
  $0 -l <log_file> -u <userlist_file> -r <report_file>

     -l  <log_file>         The relative or absolute path to the webserver logfile.
     -u  <userlist_file>    The relative or absolute path to the user list file.
     -r  <report_file>      The relative or absolute path to the generated report file.

EOUsage