Linux Shell script automatically modifies the IP address and the ip address of the linuxshell script

Linux Shell script automatically modifies the IP address and the ip address of the linuxshell script

As a Linux
SA, scripts are used in routine O & M, while static ip addresses or MAC binding are used for server ip addresses. Of course, the latter operations are relatively cumbersome, in the former, we can set the host name, ip address information, gateway, and other configurations. Modification to a specific host name is also convenient for maintenance and management. The following script is used to modify the ip address, host name, and other information as needed!

 

1. #! /Bin/sh
2. # Auto Change ip netmask gateway scripts
3. # Wugk 2012-12-17
4. Cat <EOF
5. ++ Automatically modifies ip address, host name, and other related information.
6. ETHCONF =/etc/sysconfig/network-scripts/ifcfg-eth0
7. HOSTS =/etc/hosts
8. NETWORK =/etc/sysconfig/network
9. DIR =/data/backup/'date + % Y % m % d'
10. NETMASK = 255.255.255.0
11. +++ ++ ------------------------------- ++
12. EOF
13. # Define Path defines the variable, which can be modified according to the actual situation
14.  
15. ETHCONF =/etc/sysconfig/network-scripts/ifcfg-eth0
16. HOSTS =/etc/hosts
17. NETWORK =/etc/sysconfig/network
18. DIR =/data/backup/'date + % Y % m % d'
19. NETMASK = 255.255.255.0
20.  
21. Echo "============================================== =========="
22. Echo
23. # Define the change_ip Function
24. Function Change_ip ()
25. {
26. # Determine whether the backup directory exists. There are spaces before and after brackets ,! The exclamation point in shell indicates the opposite meaning #
27. If
28. [! -D $ DIR]; then
29.  
30. Mkdir-p $ DIR
31.  
32. Fi
33.  
34. Echo "Now Change ip address, Doing Backup Interface eth0"
35. Cp $ ETHCONF $ DIR
36.  
37. Grep "dhcp" $ ETHCONF
38. # $? Used to determine the status of the last operation. The value 0 indicates that the last operation is in correct or successful status #
39. If
40.  
41. [$? -Eq 0]; then
42. # Read-p Interactive input variable IPADDR. Note that there are spaces after the colon, sed-I modify the configuration file #
43. Read-p "Please insert ip Address:" IPADDR
44. Sed-I's/dhcp/static/G' $ ETHCONF
45. # Awk-F. It means to use the. Number to separate domains and print the first three columns #
46. Echo-e "IPADDR = $ IPADDR \ nNETMASK = $ NETMASK \ nGATEWAY = 'echo $ IPADDR | awk-F. '{print $1 ". "$2 ". "$3 }''. 254 ">>$ ETHCONF
47. Echo "This IP address Change success! "
48.  
49. Else
51. Echo-n "This $ ETHCONF is static exist, please ensure Change Yes or NO ":
52. Read I
53.  
54. Fi
55.  
56. If
57. ["$ I" = "y"-o "$ I" = "yes"]; then
58. Read-p "Please insert ip Address:" IPADDR
59.  
60. Count = ('echo $ IPADDR | awk-F. '{print $1, $2, $3, $4 }'')
61. # Define an array. $ {# count [@]} indicates the total number of retrieved variable values #
62. A =$ {# count [@]}
63. # The while Condition Statement determines whether the number is correct. If the number is incorrect, the system prompts input in a loop. You can also use [0-9] to determine the ip address #
64. While
65.  
66. ["$ A"-ne "4"]
67.  
68. Do
69.  
70. Read-p "Please re Inster ip Address, example 192.168.0.11 ip": IPADDR
71. Count = ('echo $ IPADDR | awk-F. '{print $1, $2, $3, $4 }'')
72. A =$ {# count [@]}
73.  
74. Done
75. # Sed-e can be used to modify multiple parameters continuously #
76. Sed-I-e's/^ IPADDR/# IPADDR/G'-e's/^ NETMASK/# NETMASK/G'-e's/^ GATEWAY/# GATEWAY/ g' $ ETHCONF
77. # Echo-e \ n is a continuous Append content with a line feed #
78. Echo-e "IPADDR = $ IPADDR \ nNETMASK = $ NETMASK \ nGATEWAY = 'echo $ IPADDR | awk-F. '{print $1 ". "$2 ". "$3 }''. 254 ">>$ ETHCONF
79. Echo "This IP address Change success! "
80. Else
81. Echo "This $ ETHCONF static exist, please exit"
82. Exit $?
83.  
84. Fi
85. }
86. # Define the hosts Function
87. ########### Function hosts ##############
88. Function Change_hosts ()
89. {
90.  
91. If
92.  
93. [! -D $ DIR]; then
94. Mkdir-p $ DIR
95.  
96. Fi
97.  
98. Cp $ HOSTS $ DIR
99. Read-p "Please insert ip address": IPADDR
100.  
101. Host = 'echo $ IPADDR | sed's/\./-/G''
102. Cat $ HOSTS | grep 127.0.0.1 | grep "$ host"
104. If
105. [$? -Ne 0]; then
106. Sed-I "s/127.0.0.1/127.0.0.1 $ host/g" $ HOSTS
107. Echo "This hosts change success"
108.  
109. Else
110. Echo "This $ host IS Exist .........."
111.  
112. Fi
113. }
114.  
115. ########## Fuction network ###############
116. # Define network functions
117. Function Change_network ()
118. {
119. If
120.  
121. [! -D $ DIR]; then
122. Mkdir-p $ DIR
123.  
124. Fi
125. Cp $ NETWORK $ DIR
126. Read-p "Please insert ip address": IPADDR
127.  
128. Host = 'echo $ IPADDR | sed's/\./-/G''
129. Grep "$ host" $ NETWORK
130.  
131. If
132. [$? -Ne 0]; then
133. Sed-I "s/^ HOSTNAME/# HOSTNAME/g" $ NETWORK
134. Echo "NETWORK = $ host"> $ NETWORK
135.  
136. Else
137. Echo "This $ host IS Exist .........."
138.  
139. Fi
141. }
142. # The PS3 is generally a menu prompt #
143. PS3 = "Please Select ip or hosts Menu ":
144. # Select command for the menu, in the format of select $ var in... command... do... done
145. Select I in "Change_ip" "Change_hosts" "Change_network"
146. Do
147. # Case method, generally used for judgment under multiple conditions
148. Case $ I in
149. Change_ip)
150. Change_ip
151. ;;
152. Change_hosts)
153. Change_hosts
154. ;;
155. Change_network)
156. Change_network
157. ;;
158. *)
159. Echo
160. Echo "Please Insert $0: Change_ip (1) | Change_hosts (2) | Change_network (3 )"
161. Echo
162. ;;
163. Esac
164. Done