code: public void top(String arg) throws IOException {
          String top;
          if (arg.equals("1"))
              top = top1;
          else
              top = top2;
          this.println("+OK " + top.length() + " octets");
          this.writer.write(top);
          this.println(".");
      }
docs: TOP command.
  XXX - ignores number of lines argument
  
  @throws IOException
  unable to read/write to socket