bash_fast_whois_checker_function.sh

# see http://troy.yort.com/short-fast-micro-whois
# original http://gist.github.com/82956
# 0 if available
# 1 if taken
d () {                   
	# Append ".com" to input if doesn't contain a ".":
	domain=$1
	if [[ ! $1 =~ \.\w+$ ]]; then
		domain=$domain.com
	fi
  result=`dig -t NS "$domain" | grep -c "ANSWER SECTION"`
	# confirm with whois since some registered domains have no 
	# NS resource record in root servers
  if [ "$result" = "0" ]; then
		# -n not supported on osx :(
    # result=`whois -n "$domain" | grep -c "Registrar: "`
		# osx is:
		dontknow="???"
  fi        
  # Print result with color, as smiley!
  if [ "$result" = "0" ]; then
	  echo -e '\e[0;32m:)\e[00m'
	else
		echo -e '\e[0;31m:(\e[00m'
	fi
  return $result
}

bash_fast_whois_checker_ruby.sh

d () {
  # see http://troy.yort.com/short-fast-micro-whoisshort-fast-micro-whois
  # note: does not handle registered domain without NS records
  ruby -e "require 'net/dns/resolver'; available = Net::DNS::Resolver.new.send('$1', 'NS').answer.empty?; puts available ? '0' : '1'"
}