Shell获取网卡Mac地址（grep、正则表达式）

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#!/bin/bash

#brief attain the Mac addr of netcard eth0. 
#author lee
#time 18.08.10


macaddr=`sudo ifconfig |grep HWaddr |head -n 1 | grep -o  "[a-f0-9A-F]\\([a-f0-9A-F]\\:[a-f0-9A-F]\\)\\{5\\}[a-f0-9A-F]"`
echo "Mac $macaddr"