Port scanning script

#!/bin/bash
PORT1=21 #The port number
PORT2=22 #The port number
PORT3=25 #The port number
PORT4=53 #The port number
PORT5=80 #The port number
PORT6=3306 #The port number
read -p "Enter the Server IP/HOSTNAME : " HOSTNAME #Enter the Host Name to check the Open Ports
echo ""
echo "Checking the ping status of $HOSTNAME", Please wait....
echo ""
if ping -c2 $HOSTNAME |grep -i "time="
then
echo $HOSTNAME is up
else
echo "$HOSTNAME is down or unable to ping"
fi
echo ""
echo "Checking the port status of $HOSTNAME", Please wait....
echo ""
if nmap -p$PORT1 $HOSTNAME | grep -q open
then
echo $PORT1 is open
else
echo $PORT1 is down
fi
if nmap -p$PORT2 $HOSTNAME | grep -q open
then
echo $PORT2 is open
else
echo $PORT2 is down
fi
if nmap -p$PORT3 $HOSTNAME | grep -q open
then
echo $PORT3 is open
else
echo $PORT3 is down
fi
if nmap -p$PORT4 $HOSTNAME | grep -q open
then
echo $PORT4 is open