rot-all script

rotall.rb

def rotall s
  1.upto(25) { |i|
    puts "#{i}: #{s.upcase.chars.to_a.map { |c|
      case c
      when /^[A-Z]$/
        ((c.ord - 'A'.ord + i) % 26 + 'A'.ord).chr
      else
        c
      end
    }.join ''}"
  }
end

text = []
while line = gets
  text << line.strip
end
rotall text.join ' '