uidl

# File lib/net/pop.rb, line 963
    def uidl(num = nil)
      if num
        res = check_response(critical { get_response('UIDL %d', num) })
        return res.split(/ /)[1]
      else
        critical {
          getok('UIDL')
          table = {}
          @socket.each_list_item do |line|
            num, uid = line.split
            table[num.to_i] = uid
          end
          return table
        }
      end
    end