Shell脚本实现自动修改IP地址

#!/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' $ETHCONF #awk -F. 意思是以.号为分隔域，打印前三列#  echo -e "IPADDR=$IPADDR/nNETMASK=$NETMASK/nGATEWAY=`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' $ETHCONF  #echo -e /n为连续追加内容，并自动换行#  echo -e "IPADDR=$IPADDR/nNETMASK=$NETMASK/nGATEWAY=`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