# File lib/net/telnet.rb, line 678
    def cmd(options) # :yield: recvdata
      match    = @options["Prompt"]
      time_out = @options["Timeout"]
      fail_eof = @options["FailEOF"]

      if options.kind_of?(Hash)
        string   = options["String"]
        match    = options["Match"]   if options.has_key?("Match")
        time_out = options["Timeout"] if options.has_key?("Timeout")
        fail_eof = options["FailEOF"] if options.has_key?("FailEOF")
      else
        string = options
      end

      self.puts(string)
      if block_given?
        waitfor({"Prompt" => match, "Timeout" => time_out, "FailEOF" => fail_eof}){|c| yield c }
      else
        waitfor({"Prompt" => match, "Timeout" => time_out, "FailEOF" => fail_eof})
      end
    end