#!/bin/bash
while :; do
com=$(sudo arp scan-l | awk -d" " '{ print $1 " " $2 }' 2>/dev/null)
for line in $com; do
    echo $line
    if [[$line =~ "." ]]; then
        ping -c 3 $line 2>dev/null 1>/dev/null
        if [ "$?" -eq 0 ]; then
            echo $line>>test.txt
        fi
    fi
done
done