Linux系统获取网卡ip
ifconfig eth0 |sed -nr ‘2s#.*dr:(.*) Bc.*#\1#gp‘
ifconfig eth0 |sed -n ‘2s#[^0-9.]# #gp‘|awk ‘{print $1}‘
ifconfig eth0 |sed -nr ‘2s#.*dr:| Bc.*##gp‘
ifconfig eth0 |awk -F "[: ]+" ‘NR==2{print $4}‘
ifconfig eth0 |awk -F ".*dr:| Bc.*" ‘NR==2{print $2}‘
ifconfig eth0 | egrep "([0-9]{1,3}\.?){4}" -o |head -1
原文：http://www.cnblogs.com/xzy-blog/p/7805060.html