From: Christian von Kleist <cvonkleist@...>
Date: 2007-12-06T01:51:09+09:00
Subject: Ruby equivalent for `du`

I wrote a simple method for recursively finding the size of a
directory, because I didn't see anything in File::Stat or FileUtils
that does that.  Am I missing it?  Does Ruby already have an
equivalent to `du`?

  def size(f)
    return File.size(f) unless File.directory?(f)
    Dir.entries(f)[2..-1].inject(0) {|total, s| total + size(File.join(f, s))}
  end