取IP的几个方法

ifconfig eth0|grep " inet add"|cut -d":" -f2|cut -d " " -f1

ifconfig eth0|grep " inet add"|awk -F":" ‘{print $2}‘|awk -F " " ‘{print $1}‘

ifconfig eth0|awk -F "[:B]" ‘NR==2{print $2}‘

ifconfig eth0|sed -n ‘/inet addr/p‘|sed ‘s#.*addr:##g‘|sed  ‘s#  Bc.*$##g‘

ifconfig eth0|sed -n ‘s#^.*addr:\(.*\)  Bca.*$#\1#gp‘