# File lib/sys/top.rb, line 19
      def self.top(num=10, field='pctcpu')
         field = field.to_s if field.is_a?(Symbol)
         
         windows = /mswin|win32|dos|cygwin|mingw/i

         # Sort by pid on Windows by default
         if Config::CONFIG['host_os'].match(windows) && field == 'pctcpu'
            field = 'pid'
         end
         
         # Linux does not have a pctcpu field yet
         if Config::CONFIG['host_os'].match('linux') && field == 'pctcpu'
            field = 'pid'
         end
            
         Sys::ProcTable.ps.sort_by{ |obj| obj.send(field) || '' }[0..num-1]
      end