# File rbot/plugins/rot13.rb, line 5
  def privmsg(m)
    unless(m.params && m.params =~ /^.+$/)
      m.reply "incorrect usage: " + help(m.plugin)
      return
    end
    m.reply m.params.tr("A-Za-z", "N-ZA-Mn-za-m");
  end