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loop next if fail
h=%w"host1 host2 host3 host4"

h.each do |hostname|

  tn = Net::Telnet::new("Host" => "#{hostname}",
                               "Timeout" => false,
                               "Prompt" => /[$%#>] z/n)

  tn.cmd('String' =>'user' , 'Match'=>/Password:/) { |c| puts c }
  tn.cmd('String' =>'password', 'Match'=>/#/) { |c| puts c }


      tn.cmd('String' =>"show run | redirect tftp://192.1.1.1/#{hostname}-#{tdate}.cfg", 'Match'=>/#/) { |c| puts c }
      sleep(3)


end

begin
  tn = Net::Telnet::new("Host" => "#{hostname}",
                        "Timeout" => false,
                        "Prompt" => /[$%#>] z/n)
rescue => e
  puts "Unable to connect to #{hostname}: #{e.message}"
  next
end

tn = Net::Telnet::new(:host    => "#{hostname}",
                        :timeout => false,
                        :prompt  => /[$%#>] z/n)