encrypts any string using openssl key and ruby

encrypt.rb

require 'openssl'
require 'base64'

public_key_file = 'pubkey.pem';

string = ""
File.open(ARGV[0]).each_line do |line|
      string += line
end

public_key = OpenSSL::PKey::RSA.new(File.read(public_key_file))
encrypted_string = Base64.encode64(public_key.public_encrypt(string))
puts encrypted_string