ruby compare_dirs.rb /path/to/dir1 /path/to/dir2

compare_dirs.rb

require 'pp'

# https://gist.github.com/awesome/3842062
def dirHash(path)
  Dir["#{path}/**/*"].inject({}) {|h,i| t = h; i.split("/").each {|n| t[n] ||= {}; t = t[n]}; h}
end

# https://gist.github.com/henrik/146844
def deep_diff(a,b)
  (a.keys | b.keys).inject({}) do |diff, k|
    if a[k] != b[k]
      if a[k].respond_to?(:deep_diff) && b[k].respond_to?(:deep_diff)
        diff[k] = a[k].deep_diff(b[k])
      else
        diff[k] = [a[k], b[k]]
      end
    end
    diff
  end
end

pp deep_diff(dirHash(ARGV[0]), dirHash(ARGV[1]))