module Redis::Commands::Keys

def migrate(key, options)
  args = [:migrate]
  args << (options[:host] || raise(':host not specified'))
  args << (options[:port] || raise(':port not specified'))
  args << (key.is_a?(String) ? key : '')
  args << (options[:db] || @client.db).to_i
  args << (options[:timeout] || @client.timeout).to_i
  args << 'COPY' if options[:copy]
  args << 'REPLACE' if options[:replace]
  args += ['KEYS', *key] if key.is_a?(Array)
  send_command(args)
end