check-host-alive.sh

#!/bin/bash

check_port() {
sort $1 | uniq -c | sort -nr | awk {'print $2'} | while read -r ip; 
do 
  if ping -c 1 -w 1 $ip > /dev/null 2>&1; 
    then 
    	if nc -vz -w 3 $ip 25 > /dev/null 2>&1; 
    	then
    		echo $ip - Port 25 Opened;
    	else
    		echo $ip
    	fi    	
  fi;
done
}

if [ -f $1 ]
then
	check_port $1
else
	echo "$1 - File not found."
fi