browse.rb

#! /usr/bin/env ruby

require 'mechanize'

unless ARGV.size >= 2
  puts "#{File.basename($0)} <site-url> <user agent header>"
  exit 1
end

site = ARGV.shift
user_agent = ARGV.join ' '

a = Mechanize.new { |agent|
  agent.user_agent = user_agent
}

page = a.get(site)

puts site
rand(100).times do
  link = page.links.to_a.sort_by{rand}[0]
  puts link.href
  page = a.click link
end