#!/bin/bash

WORDS=$(cat /usr/share/dict/words)

IFS=$'\n'
LC_ALL=C

echo "" > domains.txt
for word in $WORDS; do
    if [[ $word =~ ^[A-Za-z]{4,12}$ ]]; then
        domain="$word.com"
        echo "checking $domain ..."
        host_result=$(timeout 3 host "$domain")
        host_retcode=$?
        whois_result=$(timeout 2 whois "$domain" | egrep -q '^No match|^NOT FOUND|^Not fo|AVAILABLE|^No Data Fou|has not been regi|No entri')
        whois_retcode=$?

        # TimeOut'ed
        if [ $host_retcode -eq 0 ] && [ $whois_retcode -eq 124 ]; then
            echo "add $domain (timeout)"
            echo "$domain" >> domains.txt
        elif [ $host_retcode -eq 0 ] && [ $whois_retcode -eq 0 ]; then
            echo "add $domain"
            echo "$domain" >> domains.txt
        fi
    fi
done