经常在linux下做网络实验的朋友，经常要反复更改ip,虽说GUI界面简化了工作量，但常常也需忙的不亦乐乎。最近写了个更改网卡ip的脚本，有不足之处，欢迎大家指正。
#!/bin/bash
echo "This will help you to change the configure of eth0!"
FILE_NAME='/etc/sysconfig/network-scripts/ifcfg-eth0'
sed -i 's/^\([[:space:]]*BOOTPROTO=\).*$/\1static/g' $FILE_NAME
read -p "Please input a right ip address:" IP_ADDR
echo $IP_ADDR | grep -E '([0-9]+(\.[0-9]+){3})' &> /dev/null
until [ $? -eq 0 ] ;do
read -p "Please input a right ip address:" IP_ADDR
echo $IP_ADDR | grep -E '([0-9]+(\.[0-9]+){3})' &> /dev/null
done
sed -i '/IPADDR=.*/'d $FILE_NAME
echo "IPADDR=$IP_ADDR >> $FILE_NAME
read -p "Please input a right netmask:" NET_MASK
echo $NET_MASK | grep -E '([0-9]+(\.[0-9]+){3})' &> /dev/null
until [ $? -eq 0 ] ;do
read -p "Please input a right netmask:" NET_MASK
echo $NET_MASK | grep -E '([0-9]+(\.[0-9]+){3})' &> /dev/null
done
sed -i '/NETMASK=.*/'d $FILE_NAME
echo "NETMASK=$NET_MASK >> $FILE_NAME
