Group all words that are anagrams of one another

anagram.rb

#!/usr/bin/ruby

# Group all words that are anagrams of one another
# example: 
# sample set of words
# dict = %w[cat tar war store core orb bro rat]
# $ ruby anagram.rb
#   expect 
#     {
#      "act"=>["cat"],
#      "art"=>["tar", "rat"],
#      "arw"=>["war"],
#      "eorst"=>["store"],
#      "ceor"=>["core"],
#      "bor"=>["orb", "bro"] 
#     }

dict = File.read('/usr/share/dict/words').split("\n")

hsh = {}

dict.each do |word|
  word = word.downcase
  sorted_word = word.chars.sort.join('')
  hsh[sorted_word] ||= []
  if hsh.keys.include?(sorted_word)
    hsh[sorted_word] << word
  end
end

p hsh