validate_md5.rb

#! /usr/bin/ruby

# USAGE: 
#  ./validate_md5.rb /path/to/file Exp3ct3dD1G35t

require 'digest/md5'

expected_digest = ARGV[1]

computed_digest = Digest::MD5.hexdigest(File.open(ARGV[0]).read)

if expected_digest == computed_digest
  puts "Valid!" 
else 
  puts "Invalid"
end 
puts "Expected: #{expected_digest}"
puts "Computed: #{computed_digest}"