resolve.sh

#!/bin/bash

ITER=5

##
function usage {
        echo "Usage: resolve [options] hostname"
        echo
        echo -e "  -t #\t\tSpecify number of lookups (default 5)"
        exit
}

function query {
        local FQDN
        local TRIES
        local DATA

        FQDN=$1
        TRIES=$2

        echo -n "Resolving $FQDN over $TRIES tries... "

        DATA=""
        i=0
        while [ $i -lt $TRIES ]; do
                HOST=$(host $FQDN | grep 'has address' | awk '{print $4}')

                DATA=$(echo -e "$DATA\n$HOST")
                DATA=$(echo "$DATA" | sort | uniq | sed '/^$/d')

                i=$((i+1))
        done

        COUNT=$(echo "$DATA" | wc -l | awk '{print $1}')

        echo "Done!"
        echo
        echo "$DATA"
        echo
        echo "Found $COUNT addresses associated with $FQDN"
}
##

## Parse params
if [ "$#" -lt 1 ]; then
        usage
fi

while getopts ":t:" opt; do
        case "${opt}" in
                t) ITER=$OPTARG
                ;;
                *) usage
                ;;
        esac
done

##
HOST="${@: -1}"
query $HOST $ITER