Change Password remotly

chgpass.rb

require 'net/ssh'


Net::SSH.start('127.0.0.1', 'user', :password => "pass") do |ssh|
   ssh.open_channel do |channel|
      channel.on_request "exit-status" do |channel, data|
        $exit_status = data.read_long
      end
     channel.request_pty do |channel, success| 
     channel.exec("sudo passwd UserName")  # Logged user shuold be root or sudoers memeber
        if success
          channel.on_data do |channel, data|
	    puts data.inspect.chomp("\r\n")
	    channel.send_data("NewpassOfUserName\n")
	    sleep 0.1
          end
        else
           puts "FAILED!!"
        end
      end
      channel.wait
      puts "SUCCESS!!" if $exit_status == 0
   end
end