#!/bin/bash
a=$(date +%H:%M:%S) ## 开始执行时间
NetC=eth0 ## 默认网卡eth0
if [ $# -ne 1 ];then
echo "Usage: please try again like : $0 {Network Card Name} "
exit
else
NetC=$1
fi
FileName=${NetC}_list
echo "待写入文件名：$FileName"
#rm -f $FileName
## 参数有效性检查，并获取IP
ifconfig $NetC > /dev/null
if [ $? -ne 0 ];then
echo -e "Network Card Name is not found by ifconfig ";exit
else
NetC_IP=`ifconfig $NetC |grep broadcast |head -n 1 | awk '{print $2}'`
fi
echo "需要寻找的是$NetC:$NetC_IP的同网段ip"
## ip生成
Lan=`echo $NetC_IP | awk -F "." '{print $1"."$2"."$3"."}'`
## 核心处理逻辑
for i in ${Lan}{1..254}
do
{
ping -c 2 $i |grep -q "ttl"
if [ $? -eq 0 ];then
echo $i >> $FileName
fi
} &
done
wait
b=$(date +%H:%M:%S) ## 结束执行时间
echo "success! $NetC的同网段ip已写入 $FileName "
echo -e "startTime:\t$a"
echo -e "endTime:\t$b"
echo "如果重复执行，生成的文件中会包含多次执行的结果，可以用 uniq |sort 命令去重排序。"
