recursive_find.rb

#!/usr/bin/env ruby
# Recursive Conditional Finder


def recursive_find(path, &condition)
  # Create entry 
  entries = Array.new

  # Look through all the files under specified directory
  Dir[path + '/*'].each do |entry|
    # If we find a directory, traverse it and append the files that meet the condition
    entries << recursive_find(entry, condition) if File.directory? entry

    # If we find a file, check it against the condition before appending it
    entries << entry if condition.call entry
  end

  # Return the flattened list
  entries.flatten
end




puts recursive_find ARGV[0] { |entry|  File.extname(entry) == ".rb" }