Automatic IP modification of Linux shell scripts

#!/bin/sh
#auto Change IP netmask Gateway scripts
#wugk 2012-12-17
Cat << EOF
++++++++ automatically modifies IP and host name information +++++++++
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 definition variable, can be modified according to the actual situation
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, there are spaces before and after the brackets! The exclamation point in the shell means the opposite.
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 $? Used to determine the state of the last operation, which is 0, indicating that the last operation state was correct or successful #
If
[$?-eq 0];then
#read-P Interactive input variable ipaddr, with a space after the colon, sed-i modify the configuration file #
Read-p "Please insert IP Address:" ipaddr
Sed-i ' s/dhcp/static/g ' $ETHCONF
#awk-F. The first three columns are printed by using the. Number as a delimited field
Echo-e "ipaddr= $IPADDR \nnetmask= $NETMASK \ngateway= ' echo $IPADDR |awk-f. ' {print $ '. $ "." $ "". 254 ">> $ETHCONF
echo "This IP address change success!"
Else
Echo-n "This $ETHCONF are static exist, please ensure change Yes or NO":
Read I
Fi
If
["$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, ${#count [@]} to get the total number of variable values #
a=${#count [@]}
#while条件语句判断, the number is correct, incorrect loop prompt input, you can also use [0-9] to Judge 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 can modify multiple parameters consecutively #
Sed-i-E ' s/^ipaddr/#IPADDR/g '-e ' s/^netmask/#NETMASK/g '-e ' s/^gateway/#GATEWAY/g ' $ETHCONF
#echo-e \ n for continuous append, and wrap line #
Echo-e "ipaddr= $IPADDR \nnetmask= $NETMASK \ngateway= ' echo $IPADDR |awk-f. ' {print $ '. $ "." $ "". 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 in the format of select $var in: command. Do .... Done
Select I in "Change_ip" "change_hosts" "Change_network"
Do
#case method, generally used for judging under a variety of conditions
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

Automatic IP modification of Linux shell scripts