dns.sh

#!/bin/bash

HOST=$1 # pasamos por parametro el host al que deseamos resolver nombre
echo "Tiempo promedio de resolución de nombres (DNS) para "$HOST": "
echo ""


for i in `seq 1 5`;
do
     dig $HOST | grep -i "Query time" | awk '{printf ("%d\n",$4)}'
done  > time.txt
 awk 'BEGIN { T=0; } {print $1}{ T = T + $1 } END{ printf ("Promedio default: %.2f", T/5) }' time.txt
echo ""

DNS1="8.8.8.8"
for i in `seq 1 5`;
do
    dig $HOST @$DNS1 | grep -i "Query time" | awk ' { printf ("%d \n",$4) }'
done  > time.txt
awk 'BEGIN { T=0; } {print $1}{ T = T + $1 } END{ printf ("Promedio '$DNS1': %.2f", T/5) }' time.txt

echo ""

DNS2="208.67.222.222"
for i in `seq 1 5`;
do
    dig $HOST @$DNS2 | grep -i "Query time" | awk ' { printf ("%d \n",$4) }'
done  > time.txt
awk 'BEGIN { T=0; } {print $1}{ T = T + $1 } END{ printf ("Promedio '$DNS2': %.2f", T/5) }' time.txt

echo ""

DNS3="209.244.0.3"
for i in `seq 1 5`;
do
    dig $HOST @$DNS3 | grep -i "Query time" | awk ' { printf ("%d \n",$4) }'
done  > time.txt
awk 'BEGIN { T=0; } {print $1}{ T = T + $1 } END{ printf ("Promedio '$DNS3': %.2f", T/5) }' time.txt

echo ""