Shell脚本实现自动修改IP地址

作为一名Linux SA，日常运维中很多地方都会用到脚本，而服务器的ip一般采用静态ip或者MAC绑定，当然后者比较操作起来相对繁琐，而前者我们可以设置主机名、ip信息、网关等配置。修改成特定的主机名在维护和管理方面也比较方便。如下脚本用途为：修改ip和主机名等相关信息，可以根据实际需求修改，举一反三！

#!/bin/sh #auto Change ip netmask gateway scripts #wugk 2012-12-17 cat << EOF ++++++++自动修改ip和主机名等相关信息+++++++++ ETHCONF=/etc/sysconfig/network-scripts/ifcfg-eth0 HOSTS=/etc/hosts NETWORK=/etc/sysconfig/network DIR=/data/backup/`date +%Y%m%d` NETMASK=255.255.255.0 +++++++++————————-+++++++++++ EOF #Define Path 定义变量，可以根据实际情况修改 ETHCONF=/etc/sysconfig/network-scripts/ifcfg-eth0 HOSTS=/etc/hosts NETWORK=/etc/sysconfig/network DIR=/data/backup/`date +%Y%m%d` NETMASK=255.255.255.0 echo “================================================” echo #定义change_ip函数 function Change_ip () { #判断备份目录是否存在，中括号前后都有空格，！叹号在shell表示相反的意思# if [ ! -d $DIR ];then mkdir -p $DIR fi echo “Now Change ip address ,Doing Backup Interface eth0” cp $ETHCONF $DIR grep “dhcp” $ETHCONF #如下$?用来判断上一次操作的状态，为0，表示上一次操作状态正确或者成功# if [ $? -eq 0 ];then #read -p 交互输入变量IPADDR，注冒号后有空格，sed -i 修改配置文件# read -p “Please insert ip Address:” IPADDR sed -i s/dhcp/static/g $ETHCONF #awk -F. 意思是以.号为分隔域，打印前三列# echo -e “IPADDR=$IPADDRnNETMASK=$NETMASKnGATEWAY=`echo $IPADDR|awk -F. {print $1″.”$2”.”$3}`.254″ >>$ETHCONF echo “This IP address Change success !” else echo -n “This $ETHCONF is static exist ,please ensure Change Yes or NO”: read i fi if [ “$i” == “y” -o “$i” == “yes” ];then read -p “Please insert ip Address:” IPADDR count=(`echo $IPADDR|awk -F. {print $1,$2,$3,$4}`) #定义数组， ${#count[@]}代表获取变量值总个数# A=${#count[@]} #while条件语句判断，个数是否正确，不正确循环提示输入，也可以用[0-9]来判断ip# while [ “$A” -ne “4” ] do read -p “Please re Inster ip Address,example 192.168.0.11 ip”: IPADDR count=(`echo $IPADDR|awk -F. {print $1,$2,$3,$4}`) A=${#count[@]} done #sed -e 可以连续修改多个参数# sed -i -e s/^IPADDR/#IPADDR/g -e s/^NETMASK/#NETMASK/g -e s/^GATEWAY/#GATEWAY/g $ETHCONF #echo -e n为连续追加内容，并自动换行# echo -e “IPADDR=$IPADDRnNETMASK=$NETMASKnGATEWAY=`echo $IPADDR|awk -F. {print $1″.”$2”.”$3}`.254″ >>$ETHCONF echo “This IP address Change success !” else echo “This $ETHCONF static exist,please exit” exit $? fi } #定义hosts函数 ############function hosts############## function Change_hosts () { if [ ! -d $DIR ];then mkdir -p $DIR fi cp $HOSTS $DIR read -p “Please insert ip address”: IPADDR host=`echo $IPADDR|sed s/./-/g` cat $HOSTS |grep 127.0.0.1 |grep “$host” if [ $? -ne 0 ];then sed -i “s/127.0.0.1/127.0.0.1 $host/g” $HOSTS echo “This hosts change success ” else echo “This $host IS Exist ……….” fi } ###########fuction network############### #定义network函数 function Change_network () { if [ ! -d $DIR ];then mkdir -p $DIR fi cp $NETWORK $DIR read -p “Please insert ip address”: IPADDR host=`echo $IPADDR|sed s/./-/g` grep “$host” $NETWORK if [ $? -ne 0 ];then sed -i “s/^HOSTNAME/#HOSTNAME/g” $NETWORK echo “NETWORK=$host” >>$NETWORK else echo “This $host IS Exist ……….” fi } #PS3一般为菜单提示信息# PS3=”Please Select ip or hosts Menu”: #select为菜单选择命令，格式为select $var in ..command.. do …. done select i in “Change_ip” “Change_hosts” “Change_network” do #case 方式，一般用于多种条件下的判断 case $i in Change_ip ) Change_ip ;; Change_hosts ) Change_hosts ;; Change_network ) Change_network ;; *) echo echo “Please Insert $0: Change_ip(1)|Change_hosts(2)|Change_network(3)” echo ;; esac done