gistfile1.rb

#!/usr/bin/env ruby

filename = ARGV.size > 0 ? ARGV[0] : nil

unless filename
  puts "usage: one_word_per_line.rb <filename>"
  exit 0
end

File.open filename do |f|
  f.readlines.each do |line|
    line.split(/\s+/).reject{|w| w.empty?}.each do |word|
      puts word
    end
  end
end