Simple domain check

check_domains.sh

#!/usr/bin/env bash

domains=($(cat $1 | awk '{print $1}'))

delta=1
arraylength=${#domains[@]}
for (( i=0; i<${arraylength}; i=$((i+$delta)) ));
do
    host "${domains[i]}"
    echo "${domains[i]} checked"
done

Sample domains.txt file:

google.com
ya.ru
github.com

How to run:

chmod +x check_domains.sh
./check_domains.sh domains.txt