linux中想在脚本中实现修改一个ip地址参数的配置文件，用sed命令如何实现？

sed -i 's/\(IP=\)\S\S*/\1102.117.2.23/' filename

注：

1）将不变的部分放入带反斜杠的一对括号 \( \) 中并在替换时用 \1 引用。

2）\S用于匹配除单个空格符之外的所有字符。

awk -F"=" '{if($1=="IP")print("IP=102.117.2.23")}' filename >filename.new 2>/dev/null

#vi config.sh

ifconfig

echo "Please input:0/1/2"

read dir

case $dir in

0)

echo -n "Please enter new ip for eth0:"

read ip0

echo -n "Please enter netmask for eth0:"

read mask0

ifconfig eth0 $ip0 netmask $mask0

service network restart

1)

echo -n "Please enter new ip for eth1:"

read ip1

echo -n "Please enter netmask for eth1:"

read mask1

ifconfig eth1 $ip1 netmask $mask1

service network restart

2)

echo -n "Please enter new ip for eth2:"

read ip2

echo -n "Please enter netmask for eth2:"

read mask2

ifconfig eth2 $ip2 netmask $mask2

service network restart

*)

echo "you can only input 0,1,2"

esac

# chmod +x config.sh

# ./config.sh

Please input:0/1/2

0

Please enter new ip for eth0:10.254.197.10

Please enter netmask for eth0:255.255.252.0

Shutting down interface eth0: [ OK ]

Shutting down loopback interface: [ OK ]

Bringing up loopback interface:[ OK ]

Bringing up interface eth0:

Determining IP information for eth0... done.

[ OK ]

================================================

以上是我运行的结果，但我只有一个网卡，所以只是测了eth0. 还没有做错误处理，所以ip和netmask一定要输入对了才好用。

---