Dig domains from txt file

dig_domains.sh

#!/bin/bash

## HOW TO USE
# sh dig_domains.sh A "8.8.8.8" (this returns the A records)
# domain.com 1224 IN A 127.0.0.1

# sh dig_domains.sh A "8.8.8.8" "mail." (returns the mail. subdomain A records)
# mail.domain1.com.    14399   IN      CNAME   domain1.com.
# mail.domain2.com.    3599    IN      A       127.0.0.1

# sh dig_domains.sh MX "8.8.8.8" |  awk '{print substr($1, 1, length($1)-1), "\t"  substr($6, 1, length($6)-1)}'
# domain.com   smtp.secureserver.net

# sh dig_domains.sh A  "8.8.8.8" |  awk '{print substr($1, 1, length($1)-1), "\t"  substr($5, 1, length($5))}'
# domain.com   127.0.0.1

## START SCRIPT
for domain in `cat /path/to/file.txt`

do

NS=$2
PREFIX=$3
TASK=$1

domain=$3$domain

#dig @$NS $domain $TASK

# host $domain

dig @$NS $domain $TASK | grep -A 1 ";; ANSWER" | grep -v -e ";; ANSWER"

#sleep 1

done