Capitalize all directory names within a given path

capitalize_dirs.rb

#! /usr/bin/env ruby
##
#  Capitalize all directory names within a given path
#
# defaults to the current working directory if no supplied path

base_dir = ARGV[0] || Dir.pwd

Dir.chdir base_dir do
  dirs = Dir.glob('*').reject { |f| !File.directory?(f) }
  dirs.map(&:downcase).sort!

  dirs.each do |dir|
    delimiter = dir[/[\W_]/]
    parts = dir.split(delimiter).map(&:capitalize)
    new_path = File.join(base_dir, parts.join(delimiter))
    old_path = File.absolute_path(dir)
    File.rename(old_path, new_path)
  end
end