#!/bin/bash/
read -p "请输入网卡名称：" a
if [ -n "$a" ]
then
ifconfig $a &> /dev/null
if [ $? -eq 0 ]
then
ifconfig $a | awk ‘{printf $2 "\n"}‘ | egrep "([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0 -9]|25[0-5])\.){2}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])"
else
echo "该网卡不存在"
fi
else
echo "网卡名称不能为空"
fi原文：http://blog.51cto.com/13442309/2110347