Script that prints 50 more used terms in a given Lovecraft story passed as argument

cthulhu.rb

class CthulhuBag
  def initialize
    @h = Hash.new{ 0 }
  end
  def <<(o)
    @h[o] += 1
  end
  def [](o)
    @h[o]
  end
  def sort
    @h.sort_by{ |key, value| value}.reverse!
  end
end

filename = ARGV.first
content = IO.read(filename).downcase.gsub(/[^a-z\s]/, '')
words = content.split(' ').select{|w| w.length > 5}
bag = CthulhuBag.new
words.each { |w| bag << w }
result = bag.sort.take(50)
result.each { |h| puts "#{h.first} #{h.last}" }