天気予報を取得するスクリプト ref: http://qiita.com/items/04d2c773d4ee429cc295

weather.rb

#!/usr/bin/env ruby
# encoding : utf-8

require 'open-uri'
require 'rexml/document'

CACHE = "/tmp/ustatus.rb.cache"

if File.exist?(CACHE) && (Time.now - File::Stat.new(CACHE).mtime) <= 2000
  print File.read(CACHE)
  exit
end

url = URI.parse('http://www.google.com/ig/api?weather=naha,okinawa&hl=ja')
res = url.read('r:binary').encode("UTF-8", invalid: :replace, undef: :replace)
rss = REXML::Document.new(res) 

condition = rss.elements['//weather/current_conditions/condition/@data'].value.strip
wind_condition = rss.elements['//weather/current_conditions/wind_condition/@data'].value.strip
wind, windy, tani = *wind_condition.split(':').last.split(' ')
temp_c = rss.elements['//weather/current_conditions/temp_c/@data'].value.strip + 'C'
msg = [condition, temp_c, wind, windy + tani].join(' ')

if msg.nil?
  File.delete CACHE
else
  open(CACHE, 'w'){|io| io.print msg}
  print msg
end