Domain Name Search

domain_check.sh

#!/bin/bash

# Name: Check for domain name availability (as featured on https://stanbright.com/domain-name-search)
#
# To use this script, add it to your ~/bin directory and make it executable.
# Then you can search for specific domains like this: > domain_check.sh my-new-domain
#
# Alternatively: 
# - Generate domain name ideas based on a keyword: https://www.saashub.com/namebounce-alternatives
# - Search domain names as you type: https://www.saashub.com/domaintyper-alternatives
# 
# Please copy, share, redistribute and improve (linuxconfig.org)

if [ "$#" == "0" ]; then
    echo "You need tu supply at least one argument!"
    exit 1
fi

DOMAINS=( '.com' '.io' )

ELEMENTS=${#DOMAINS[@]}

while (( "$#" )); do

  for (( i=0;i<$ELEMENTS;i++)); do
      whois $1${DOMAINS[${i}]} | egrep -q '^No match|^NOT FOUND|^Not fo|AVAILABLE|^No Data Fou|has not been regi|No entri'
	  if [ $? -eq 0 ]; then
	      echo "$1${DOMAINS[${i}]} - available"
	  fi
  done

shift

done

whois was throwing an error for newly released TLDs on my old system
getaddrinfo(whois.dotproregistry.net): Name or service not known

so instead I used the less accurate, less detectable host nameserver lookup technique:
host -t ns $1${DOMAINS[${i}]} | egrep -q '^No match|^NOT FOUND|^Not fo|AVAILABLE|^No Data Fou|has not been regi|No entri|not found'