add ex3 to Checks to see if hosts are alive

alive2.sh

+#!/bin/bash
+# alive2.sh
+# Checks to see if hosts are alive
+# Iterate through IP addresses
+
+hosts=$1
+
+n1=$(echo $hosts | cut -d "-" -f1 | cut -d "." -f4)
+n2=$(echo $hosts | cut -d "-" -f2 | cut -d "." -f4)
+
+for ((n = n1; n <= n2; n++)); do
+    host=192.168.0.$n
+    ping -c2 $host &> /dev/null
+    if [ $? = 0 ]; then
+    echo "$host is UP"
+    else
+    echo "$host is DOWN"
+    fi
+done
+