dig.sh

#!/bin/bash

RECORD='ip-10-252-91-139.eu-west-2.compute.internal'

echo 'DATE;TIME_CMD_ELAPSED;SERVER;HEADER;TIME_DIG'

while true; do
        date_log=$(date +%Y-%m-%d\ %H\:%M\:%S)
        timestamps_start=$(date +%s%3N)
        test_resolution=$(dig @127.0.0.1 "${RECORD}" +retry=0 +timeout=1)
        timestamps_end=$(date +%s%3N)

        dns_time=$(echo -n "${test_resolution}" | grep ';; Query time:' | awk -F ":" '{print $2}')
        dns_server=$(echo -n "${test_resolution}" | grep ';; SERVER:' | awk -F '[:(]' '{print $2}')
        dns_header=$(echo -n "${test_resolution}" | grep ';; ->>HEADER<<-' | awk -F '[:,]' '{print $4}')
        time_elapsed=$((${timestamps_end}-${timestamps_start}))
        echo "${date_log};${time_elapsed};${dns_server};${dns_header};${dns_time}"

#       sleep 1
done