#!/bin/sh 
#auto Change ip netmask gateway scripts 
#chenhao 2023-06-17 
cat << EOF 
++++++++自動：修改ip和主機名等相關信息+++++++++ 
ETHCONF=/etc/sysconfig/network-scripts/ifcfg-ens33
HOSTS=/etc/hosts
NETWORK=/etc/sysconfig/network
DIR=/data/backup/`date +%Y%m%d` 
NETMASK=255.255.255.0 
EOF 

#Define Path 定義變量，可以根據實際情況修改 
 
 ETHCONF=/etc/sysconfig/network-scripts/ifcfg-ens33
 HOSTS=/etc/hosts 
 NETWORK=/etc/sysconfig/network 
 DIR=/data/backup/`date +%Y%m%d` 
 NETMASK=255.255.255.0 
 

echo 
#定義change_ip函數 
function Change_ip () 
{ 
#判斷備份目錄是否存在，中括號前后都有空格，！嘆號在shell表示相反的意思# 
if 
 [ ! -d $DIR ];then 
  mkdir -p $DIR 
fi 
 echo "Now Change ip address ,Doing Backup Interface ens33" 
 cp $ETHCONF $DIR 
 
 grep "dhcp" $ETHCONF 
#如下$?用來判斷上一次操作的狀態，為0，表示上一次操作狀態正確或者成功# 
if 
 
 [ $? -eq 0 ];then 
#read -p 交互輸入變量IPADDR，注冒號后有空格，sed -i 修改配置文件# 
 read -p "Please insert ip Address:" IPADDR 
 sed -i 's/dhcp/static/g' $ETHCONF 
#awk -F. 意思是以.號為分隔域，打印前三列# 
 echo -e "IPADDR=$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}'`) 
 #定義數組， ${#count[@]}代表獲取變量值總個數# 
 A=${#count[@]} 
 #while條件語句判斷，個數是否正確，不正確循環提示輸入，也可以用[0-9]來判斷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 可以連續修改多個參數# 
 sed -i -e 's/^IPADDR/#IPADDR/g' -e 's/^NETMASK/#NETMASK/g' -e 's/^GATEWAY/#GATEWAY/g' $ETHCONF 
 #echo -e \n為連續追加內容，并自動換行# 
 echo -e "IPADDR=$IPADDR\nNETMASK=$NETMASK\nGATEWAY=`echo $IPADDR|awk -F. '{print $1"."$2"."$3}'`.2" >>$ETHCONF 
 echo "This IP address Change success !" 
else 
 echo "This $ETHCONF static exist,please exit" 
 exit $? 
 
fi 
 
} 
 
#定義hosts函數 
############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############### 
#定義network函數 
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 
 
} 
 
#PS3一般為菜單提示信息# 
 PS3="Please Select ip or hosts Menu": 
#select為菜單選擇命令，格式為select $var in ..command.. do .... done 
 select i in "Change_ip" "Change_hosts" "Change_network" 
 
do 
#case 方式，一般用于多種條件下的判斷 
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