Automatic IP modification of Linux shell scripts

As a Linux
SA, daily operations in many places will use the script, and the server's IP generally use static IP or Mac binding, of course, the latter is relatively cumbersome to operate, while the former we can set the hostname, IP information, gateway and other configuration. Modification to a specific hostname is also more convenient for maintenance and management. The following script uses for: modify IP and hostname and other related information, can be modified according to the actual needs, extrapolate!

2. #!/bin/sh
4. #auto Change IP netmask Gateway scripts
6. #wugk 2012-12-17
8. Cat << EOF
10. ++++++++ automatically modifies IP and host name information +++++++++
12. Ethconf=/etc/sysconfig/network-scripts/ifcfg-eth0
14. Hosts=/etc/hosts
16. Network=/etc/sysconfig/network
18. dir=/data/backup/' Date +%y%m%d '
20. netmask=255.255.255.0
22. +++++++++-------------------------+++++++++++
24. Eof
26. #Define Path definition variable, can be modified according to the actual situation
30. Ethconf=/etc/sysconfig/network-scripts/ifcfg-eth0
32. hosts=/etc/hosts
34. network=/etc/sysconfig/network
36. dir=/data/backup/' Date +%y%m%d '
38. netmask=255.255.255.0
42. echo "================================================"
44. Echo
46. #定义change_ip函数
48. function Change_ip ()
50. {
52. #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.
54. If
56. [!-D $DIR];then
60. Mkdir-p $DIR
64. Fi
68. echo "Now change IP address, Doing Backup Interface eth0"
70. CP $ETHCONF $DIR
74. grep "DHCP" $ETHCONF
76. #如下 $? Used to determine the state of the last operation, which is 0, indicating that the last operation state was correct or successful #
78. If
82. [$?-eq 0];then
84. #read-P Interactive input variable ipaddr, with a space after the colon, sed-i modify the configuration file #
86. Read-p "Please insert IP Address:" ipaddr
88. Sed-i ' s/dhcp/static/g ' $ETHCONF
90. #awk-F. The first three columns are printed by using the. Number as a delimited field
92. Echo-e "ipaddr= $IPADDR \nnetmask= $NETMASK \ngateway= ' echo $IPADDR |awk-f. ' {print $ '. $ "." $ ". 254" >> $ETHCONF
94. echo "This IP address change success!"
98. Else
102. Echo-n "This $ETHCONF are static exist, please ensure change Yes or NO":
104. Read I
108. Fi
112. If
114. ["$i" = = "Y"-o "$i" = = "Yes"];then
116. Read-p "Please insert IP Address:" ipaddr
120. count= (' echo $IPADDR |awk-f. ' {print $1,$2,$3,$4} ')
122. #定义数组, ${#count [@]} to get the total number of variable values #
124. a=${#count [@]}
126. #while条件语句判断, the number is correct, incorrect loop prompt input, you can also use [0-9] to Judge ip#
128. While
132. ["$A"-ne "4"]
136. Do
140. Read-p "Please re inster ip address,example 192.168.0.11 IP": ipaddr
142. count= (' echo $IPADDR |awk-f. ' {print $1,$2,$3,$4} ')
144. a=${#count [@]}
148. Done
150. #sed-E can modify multiple parameters consecutively #
152. Sed-i-E ' s/^ipaddr/#IPADDR/g '-e ' s/^netmask/#NETMASK/g '-e ' s/^gateway/#GATEWAY/g ' $ETHCONF
154. #echo-e \ n for continuous append, and wrap line #
156. Echo-e "ipaddr= $IPADDR \nnetmask= $NETMASK \ngateway= ' echo $IPADDR |awk-f. ' {print $ '. $ "." $ ". 254" >> $ETHCONF
158. echo "This IP address change success!"
160. Else
162. echo "This $ETHCONF static Exist,please exit"
164. Exit $?
168. Fi
170. }
172. #定义hosts函数
174. ########### #function hosts##############
176. function change_hosts ()
178. {
182. If
186. [!-D $DIR];then
188. Mkdir-p $DIR
192. Fi
196. CP $HOSTS $DIR
198. Read-p "Please insert IP address": ipaddr
202. host= ' echo $IPADDR |sed ' s/\./-/g '
204. Cat $HOSTS |grep 127.0.0.1 |grep "$host"
208. If
210. [$?-ne 0];then
212. Sed-i "s/127.0.0.1/127.0.0.1 $host/g" $HOSTS
214. echo "This hosts change success"
218. Else
220. echo "This $host is Exist ...."
224. Fi
226. }
230. ########## #fuction network###############
232. #定义network函数
234. function Change_network ()
236. {
238. If
242. [!-D $DIR];then
244. Mkdir-p $DIR
248. Fi
250. CP $NETWORK $DIR
252. Read-p "Please insert IP address": ipaddr
256. host= ' echo $IPADDR |sed ' s/\./-/g '
258. grep "$host" $NETWORK
262. If
264. [$?-ne 0];then
266. Sed-i "s/^hostname/#HOSTNAME/g" $NETWORK
268. echo "network= $host" >> $NETWORK
272. Else
274. echo "This $host is Exist ...."
278. Fi
282. }
284. #PS3一般为菜单提示信息 #
286. ps3="Please select IP or hosts menu":
288. #select为菜单选择命令 in the format of select $var in: command. Do .... Done
290. Select I in "Change_ip" "change_hosts" "Change_network"
292. Do
294. #case method, generally used for judging under a variety of conditions
296. Case $i in
298. CHANGE_IP)
300. Change_ip
302. ;;
304. change_hosts)
306. Change_hosts
308. ;;
310. Change_network)
312. Change_network
314. ;;
316. *)
318. Echo
320. echo "Please Insert $0:change_ip (1) | Change_hosts (2) | Change_network (3) "
322. Echo
324. ;;
326. Esac
328. Done

Automatic IP modification of Linux shell scripts