检测局域网中未使用的IP地址

#!/bin/bash
echo "检测局域网中未使用的IP地址2015"
echo ""

processbar() {
local current=$1; local total=$2;
local maxlen=80; local barlen=66; local perclen=14;
local format="%-${barlen}s%$((maxlen-barlen))s"
local perc="[$current/$total]"
local progress=$((current*barlen/total))
local prog=$(for i in `seq 0 $progress`; do printf '#'; done)
printf "\r$format" $prog $perc
}

for i in `seq 1 254`; do
processbar $(($i*100/254)) 100

/usr/bin/arping  -I eth0 -c 1  192.168.10.$i  | grep -B 2 "Received 0" |head -1  >> mac$(date +%Y%m%d).txt ;
done

#!/bin/bash
echo 查找未使用的IP地址，通过检测MAC，来找，如果没有开机，无法找到！
for ((  i=1 ; i<254; i++ ))
do
/usr/bin/arping  -I eth0 -c 1  192.168.0.$i  | grep -B 2 "Received 0" | grep "192.168.0." >>mac$(date +%Y%m%d).txt ;
#              sleep 3
echo -e  "-->  $(($i*100/254)) %  \c "

done
echo 100%执行完毕，已输出到当前目录下的mac$(date +%Y%m%d).txt文件，请查看！