补充：这是对于第一次添加的网卡有效，如果需要重复添加和删除后自动配置，需要更改脚本，改为根据ip a命令的信息来修改。

#!/bin/bash
#update:2013-02-25
#author:ihuotui
#version 0.1

cdate=$(date '+%Y%m%d')
num=$(ifconfig -a | grep eth | wc -l)
echo "ethX=" $num >> ethX

for ((n=1;n<${num};n++))
    do

       if [ -e /etc/sysconfig/network-scripts/ifcfg-eth${n} ] ; then

           sed -i '/HWADDR/d' /etc/sysconfig/network-scripts/ifcfg-eth${n}
           ifconfig -a | grep "eth${n}" | awk '{print "HWADDR=""$5"""}' >> /etc/sysconfig/network-scripts/ifcfg-eth${n}    

      else
           touch /etc/sysconfig/network-scripts/ifcfg-eth${n}
           ifconfig -a | grep "eth${n}" | awk '{print "HWADDR=""$5"""}' >> /etc/sysconfig/network-scripts/ifcfg-eth${n}
           echo NM_CONTROLLED=""yes"" >> /etc/sysconfig/network-scripts/ifcfg-eth${n}
           echo ONBOOT=""yes"" >> /etc/sysconfig/network-scripts/ifcfg-eth${n}
           echo TYPE=""Ethernet"" >> /etc/sysconfig/network-scripts/ifcfg-eth${n}
           echo BOOTPROTO=""dhcp"" >> /etc/sysconfig/network-scripts/ifcfg-eth${n}
           echo UUID=""2460e474-fad8-4b46-baba-da6f45ae158"${n}""" >> /etc/sysconfig/network-scripts/ifcfg-eth${n}
           echo DEVICE=""eth"${n}""" >> /etc/sysconfig/network-scripts/ifcfg-eth${n}

           continue
       fi
    done

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