gistfile1.rb

#! /usr/bin/ruby

n = 52 # size of deck

s = 8 # number of shuffles

cards = []
n.times {|card| cards << card}

s.times do |shuffle|
    
  a = cards[0...(n/2)]
  b = cards[(n/2)..n ]
  
  n.times do |c|
    cards[c] = (c%2==0 ? a : b).shift 
  end

  puts "#{shuffle+1}.\t #{cards.join ','}"

end