#!/bin/bash  ########################################################  Ip=`ifconfig eth0|awk -F '[:B]' '/inet addr/{print $2}'`  Mask=`ifconfig eth0|awk -F'[:$]' '/inet addr/{print $4}'`    for ((i=1;i< =4;i++));do      Tmp=`echo $Ip|awk -F "." '{printf $'$i'}'`      Ip_Bin+=`echo "obase=2;$Tmp"|bc|awk '{printf "%08d\n",$0}'`      Tmp1=`echo $Mask|awk -F "." '{printf $'$i'}'`      Mask_Bin+=`echo "obase=2;$Tmp1"|bc|awk '{printf "%08d\n",$0}'`  done;    Mask_Lng=`printf ${Mask_Bin%%0*}|wc -c`  MyNet=${Ip_Bin:0:$Mask_Lng}$(printf "%0$((32-$Mask_Lng))d")  MyBro=${Ip_Bin:0:$Mask_Lng}$(printf "%0$((32-$Mask_Lng))d"|tr 0 1)    echo -e "\n---------- "start at $(date +"%Y-%m-%d %H:%M:%S")"\n">$HOME/ScanIpMac.lst  for (( i=$((2#$MyNet+1)); i< $((2#$MyBro)); i++ )); do      Tmp=$(echo "obase=2;$i"|bc)      Ip=$(for i in {0..3};do test $i != 0 && printf '.'; printf $((2#${Tmp:$i*8:8}));done)      ping -n -w 1 -c 1 $Ip > /dev/null 2>&1      if [ $? == 0 ];then          Mac=`arp -n $Ip|grep $Ip|awk -F " " '{print $3}'`          echo $Ip"       "$Mac |tee -a $HOME/ScanIpMac.lst      fi  done;  echo -e "\n---------- "End at $(date +"%Y-%m-%d %H:%M:%S")>>$HOME/ScanIpMac.lst    exit 0