Unlimited subdomain finder

sub.sh

#!/bin/bash   
# wget dulu
# wget https://gist.githubusercontent.com/meicookies/4507d531cda7325f1204a52dec59d883/raw/4d0110260f65624183b43eb22299c8be72d2c755/subdo.rb -O .subdo && chmod +x .subdo       
# apt install ruby
# gem install crtsh
if [[ -z $1 ]]; then
  echo "usage: bash sub.sh <situs>"
  exit
fi
./.subdo $1 > .sub && sort .sub | uniq; rm .sub

subdo.rb

#!/usr/bin/ruby

require 'crtsh'

api = Crtsh::API.new
res = api.search("#{ARGV[0]}", match: 'ILIKE')
res.each do |x|
  puts "[+] #{x["common_name"]}"
end
puts "[*] Subdomains [\e[92m#{ARGV[0]}\e[0m]"