Checks whether the version of Git you have installed is the latest.

isthereanewgit.rb

require 'open-uri'
require 'rubygems'
require 'nokogiri'

doc = Nokogiri::HTML(open('http://git-scm.com/'))
latest = if doc.css('#ver').first.content =~ /v([0-9.]+)/
   $1
else
  abort "Borked"
end

installed = if `git --version` =~ /version ([0-9.]+)/
  $1
else
  abort "Borked"
end

if installed != latest
  puts "Yep"
else
  puts "Nope"
end