From Best of Ruby Quiz by James Edward Gray II.

lcd_numbers.rb

# This program dispalys LCD-style numbers in terminal.
# Digits to be displayed are passed as an argument from the command line.
# Size can be controled with the command-line option -s followed by a positive integer.
# example: $ ruby lcd_numbers.rb -s 5 1234

class LCDNumber
  def initialize (digits, size = 2, h_char = '-', v_char = '|' )
    @digits = digits.split(//)
    @size = size
    @h_char = h_char
    @v_char = v_char
  end

  def horizontals(array)
    @digits.each do |digit|
      if array[digit.to_i] == 1
        print '  ' + @h_char * @size + '  '
      else
        print '  ' + ' ' * @size + '  '
      end
    end
    puts
  end

  def verticals(array)
    @size.times do
      @digits.each do |digit|
        if array[digit.to_i][0] == 1
          print ' ' + @v_char
        else
          print '  '
        end
        print ' ' * @size
        if array[digit.to_i][1] == 1
          print @v_char + ' '
        else
          print '  '
        end
      end
      puts
    end
  end

  def print_lcd
    #characters for each level, top to bottom, for digits 0 to 9
    one = [1,0,1,1,0,1,1,1,1,1]
    two = [[1,1],[0,1],[0,1],[0,1],[1,1],[1,0],[1,0],[0,1],[1,1],[1,1]]
    three = [0,0,1,1,1,1,1,0,1,1]
    four = [[1,1],[0,1],[1,0],[0,1],[0,1],[0,1],[1,1],[0,1],[1,1],[0,1]]
    five = [1,0,1,1,0,1,1,0,1,0]

    horizontals(one)
    verticals(two)
    horizontals(three)
    verticals(four)
    horizontals(five)
  end
end

size = nil

if ARGV.size > 1 && ARGV[0] == '-s'
  size = ARGV[1].to_i
  ARGV.shift(2)
end

digits = ARGV[0]

if size != nil
  myLCD = LCDNumber.new(digits, size)
else
  myLCD = LCDNumber.new(digits)
end

myLCD.print_lcd