Not-perfect-at-all bash script to check if websites use Cloudflare (Cloudbleed) by providing a list

cloudflare_check.sh

#!/bin/bash
# 
# To use:
# ./cloudflare_check.sh list.csv
# ./cloudflare_check.sh urls.txt
# 
# I made this to check my 1Password logins.
# You can export all of your logins by going into
# File > Export > All Items
# http://i.imgur.com/orMuAob.jpg

filename="$1"
text_bold=$(tput bold)
text_red=$(tput setaf 1)
text_green=$(tput setaf 2)
text_normal=$(tput sgr0)

while read -r line
do
  url=$(grep -oE '[[:alnum:]]+[.][[:alnum:]_.-]+' <<< $line | sed 's/www.//')
  if ! [[ -z "$url" ]]; then
    if $(dig $url +short | head -n1 | xargs -- whois | grep -m1 cloudflare > /dev/null); then
        printf "$url ${text_bold}${text_red}uses Cloudflare.${text_normal} \n"
    fi
  fi
done < "$filename"