Simple Ruby app to convert text to binary

binary.rb

#!/usr/bin/env ruby

# Convert strings into binary!
# save as binary (without .rb)
# Usage ./binary string to be converted to binary (quotes not required)

class String
  def to_binary
    binary = ""

    self.each_byte do |b|
      bin_bitsize = 8
      bin_bit = b.to_s(2)
      pad = '0' * (bin_bitsize - bin_bit.length)
      bin_bit = pad + bin_bit
      binary << bin_bit
    end

    binary
  end
end

string = ARGV[0..ARGV.size].join(" ")
puts string.to_binary