the third question

Alive.sh

+#!/bin/bash
+
+touch file
+echo "$1" > file
+
+first=$(echo $($file | cut -d"-" -f 1 | cut -d"." -f 4))
+second=$(echo $($file | cut -d"-" -f 2 | cut -d"." -f 4))
+
+
+if [ $first -lt $second ];
+then
+for n in {$first..$second}; do
+    host=192.168.1.$n
+    ping -c2 $host &> /dev/null
+    if [ $? = 0 ]; then
+    echo "$host is UP"
+    else
+    echo "$host is DOWN"
+    fi
+done
+fi

alive.sh

+#!/bin/bash
+
+touch file
+echo "$1" > file
+
+first=$(echo $($file | cut -d"-" -f 1 ))
+second=$(echo $($file | cut -d"-" -f 2 ))
+
+x=$(echo $(cut -d"." -f 4 $first))
+y=$(echo $(cut -d"." -f 4 $second))
+
+
+if [ $x -lt $y ];
+then
+for n in {$x..$y}; do
+    host=192.168.1.$n
+    ping -c2 $host &> /dev/null
+    if [ $? = 0 ]; then
+    echo "$host is UP"
+    else
+    echo "$host is DOWN"
+    fi
+done
+fi

d

+192.168.1.7-192.168.1.123
+

file

+192.168.1.7-192.168.1.123