TCP ping in Ruby

tcping

#!/usr/bin/env ruby

require "socket"
require "timeout"

if ARGV.length < 2
  puts "usage: tcping HOST PORT"
  exit 1
end

host = ARGV[0]
port = ARGV[1].to_i

loop do
  start = Time.now
  status = "OK"
  begin
    Timeout.timeout(1) { TCPSocket.new(host, port) }
  rescue Timeout::Error
    status = "Timeout"
  rescue Errno::ECONNREFUSED
    status = "Connection refused"
  end

  time_ms = ((Time.now - start) * 1000).to_i
  puts "#{status} % 4d ms" % time_ms

  sleep 0.5
end