gistfile1.rb

# one 1_1 2_1 two 1_2 2_2

def foo(h1, h2)
  tmp = Hash.new {|hash, key| hash[key] = "" }
  h1.each {|k,v| tmp[k] << v }
  h2.each {|k,v| tmp[k] << " " + v }
  tmp
end

hash1 = { "one" => "1_1" , "two" => "1_2" }
hash2 = { "one" => "2_1" , "two" => "2_2" }

new_hash = foo(hash1, hash2)
new_hash.each {|k,v| puts "#{k}: #{v}"}