clear dns cache script for yamaha routers

yamaha-dns-cache-clear.rb

# -*- encoding: utf-8 -*-
# vim: set filetype=ruby expandtab tabstop=4 shiftwidth=4 autoindent smartindent:

require 'net/telnet'
require 'yaml'

routers = YAML.load_file(ARGV[0])

routers.each do |router|
    begin
        telnet = Net::Telnet.new("Host" => router)
        telnet.waitfor(/Password:/)
        telnet.puts(ARGV[1])
        telnet.waitfor(/>/)
        telnet.puts("administrator")
        telnet.waitfor(/Password:/)
        telnet.puts(ARGV[1])
        telnet.waitfor(/#/)
        telnet.puts("clear dns cache")
        telnet.close
    rescue Net::OpenTimeout => e
        puts router
        puts e
    end
end