Check alive ip with bash file

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#!/bin/bash ##################################### #This script for # #alive ip and show name # #uses module arping and work # #for this time only by Debian bases # ##################################### #GLOBAL VARIABLE LOGFILE=logping.log #LogFile ARPING="apt-get install arping" #Install arping HPING="apt-get install hping3" #Install hping3 ETH=$1 #Device Name IP=$(ifconfig $ETH | grep "inet addr" | cut -d":" -f2 | cut \ -d" " -f1 | cut -d"." -f1-3) #Found Ip #CREATE FUNCTION FOR READLINE readlines() { while read line; do ping=`ping -c 1 -b $line` && echo -e "\n**********************************************************************" echo "IP $line UP" `arp -i $ETH $line | grep ether | awk '{print "Name " $1 " With macaddr "$3}'` echo -e "\n" echo `hping3 -c 1 -i $ETH $line --scan 0-6000 -S |awk '{print $1}' 2>&1` done < $LOGFILE exit 1 } if [ -s "$LOGFILE" ] then rm $LOGFILE fi #DONE WITH FUNCTION #Check if corect start script #t.e. enter device name eth0 for example if [ $# -ne 1 ]; then echo "Usage - ./ping_and_scan.sh (Enter device like eth0)" exit fi #somtimes finction not work with #start with user privileg #next row check if script start #with user access if [ "$(id -u)" != "0" ]; then echo "This script must be run as root" 1>&2 exit 1 fi #For reason script work with #arping, check if pacckages instaled #if not it is installed with root access if [ "$(dpkg -s arping | grep 'Status: install ok' | cut -d" " -f3)" != "ok" ];then echo "packages arping is not installed - Packages Install " echo `$ARPING` && exit 1 fi if [ "$(dpkg -s hping3 | grep 'Status: install ok' | cut -d" " -f3)" != "ok" ];then echo "packages hping3 is not isntalled - Packages Install " echo `HPING` && exit 1 fi #Variable for Device #Check for ip address ping_scanning(){ for addr in $(seq 1 255); do arp_alive=`arping -c 1 $IP.$addr | grep "bytes from" |\ cut -d " " -f 5 | cut -d "(" -f 2 |\ cut -d ")" -f 1 1>&2 >> $LOGFILE &` done } ping_scanning echo "Arp is working Waiting " while true; do if ! pgrep arping > /dev/null; then readlines else echo -n "." fi sleep .3 done