Linux Shell脚本之自动修改IP

作为一名Linux
SA，日常运维中很多地方都会用到脚本，而服务器的ip一般采用静态ip或者MAC绑定，当然后者比较操作起来相对繁琐，而前者我们可以设置主机名、ip信息、网关等配置。修改成特定的主机名在维护和管理方面也比较方便。如下脚本用途为：修改ip和主机名等相关信息，可以根据实际需求修改，举一反三！

1. #!/bin/sh
2. #auto Change ip netmask gateway scripts
3. #wugk 2012-12-17
4. cat << EOF
5. ++++++++自动修改ip和主机名等相关信息+++++++++
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  定义变量，可以根据实际情况修改
14. ETHCONF=/etc/sysconfig/network-scripts/ifcfg-eth0
15. HOSTS=/etc/hosts
16. NETWORK=/etc/sysconfig/network
17. DIR=/data/backup/`date +%Y%m%d`
18. NETMASK=255.255.255.0
19. echo "================================================"
20. echo
21. #定义change_ip函数
22. function Change_ip ()
23. {
24. #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#
25. if
26. [ ! -d $DIR ];then
27. mkdir -p $DIR
28. fi
29. echo "Now Change ip address ,Doing Backup Interface eth0"
30. cp $ETHCONF $DIR
31. grep "dhcp"  $ETHCONF
32. #如下$?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#
33. if
34. [ $? -eq 0 ];then
35. #read -p 交互输入变量IPADDR，注冒号后有空格，sed -i 修改配置文件#
36. read -p "Please insert ip Address:" IPADDR
37. sed -i 's/dhcp/static/g' $ETHCONF
38. #awk -F. 意思是以.号为分隔域，打印前三列#
39. echo -e "IPADDR=$IPADDR\nNETMASK=$NETMASK\nGATEWAY=`echo $IPADDR|awk -F. '{print $1"."$2"."$3}'`.254" >>$ETHCONF
40. echo "This IP address Change success !"
41. else
42. echo -n  "This $ETHCONF is static exist ,please ensure Change Yes or NO":
43. read i
44. fi
45. if
46. [ "$i" == "y" -o "$i" == "yes" ];then
47. read -p "Please insert ip Address:" IPADDR
48. count=(`echo $IPADDR|awk -F. '{print $1,$2,$3,$4}'`)
49. #定义数组， ${#count[@]}代表获取变量值总个数#
50. A=${#count[@]}
51. #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#
52. while
53. [ "$A" -ne "4" ]
54. do
55. read -p "Please re Inster ip Address,example 192.168.0.11 ip": IPADDR
56. count=(`echo $IPADDR|awk -F. '{print $1,$2,$3,$4}'`)
57. A=${#count[@]}
58. done
59. #sed -e 可以连续修改多个参数#
60. sed -i -e 's/^IPADDR/#IPADDR/g' -e 's/^NETMASK/#NETMASK/g' -e 's/^GATEWAY/#GATEWAY/g' $ETHCONF
61. #echo -e \n为连续追加内容，并自动换行#
62. echo -e "IPADDR=$IPADDR\nNETMASK=$NETMASK\nGATEWAY=`echo $IPADDR|awk -F. '{print $1"."$2"."$3}'`.254" >>$ETHCONF
63. echo "This IP address Change success !"
64. else
65. echo "This $ETHCONF static exist,please exit"
66. exit $?
67. fi
68. }
69. #定义hosts函数
70. ############function hosts##############
71. function Change_hosts ()
72. {
73. if
74. [ ! -d $DIR ];then
75. mkdir -p $DIR
76. fi
77. cp $HOSTS $DIR
78. read -p "Please insert ip address": IPADDR
79. host=`echo $IPADDR|sed 's/\./-/g'`
80. cat $HOSTS |grep 127.0.0.1 |grep "$host"
81. if
82. [ $? -ne 0 ];then
83. sed -i "s/127.0.0.1/127.0.0.1 $host/g" $HOSTS
84. echo "This hosts change success "
85. else
86. echo "This $host IS Exist .........."
87. fi
88. }
89. ###########fuction network###############
90. #定义network函数
91. function Change_network ()
92. {
93. if
94. [ ! -d $DIR ];then
95. mkdir -p $DIR
96. fi
97. cp $NETWORK $DIR
98. read -p "Please insert ip address": IPADDR
99. host=`echo $IPADDR|sed 's/\./-/g'`
100. grep "$host" $NETWORK
101. if
102. [ $? -ne 0 ];then
103. sed -i "s/^HOSTNAME/#HOSTNAME/g" $NETWORK
104. echo "NETWORK=$host" >>$NETWORK
105. else
106. echo "This $host IS Exist .........."
107. fi
108. }
109. #PS3一般为菜单提示信息#
110. PS3="Please Select ip or hosts Menu":
111. #select为菜单选择命令，格式为select $var in ..command.. do .... done
112. select i in  "Change_ip" "Change_hosts" "Change_network"
113. do
114. #case 方式，一般用于多种条件下的判断
115. case $i in
116. Change_ip )
117. Change_ip
118. ;;
119. Change_hosts )
120. Change_hosts
121. ;;
122. Change_network )
123. Change_network
124. ;;
125. *)
126. echo
127. echo "Please Insert $0: Change_ip(1)|Change_hosts(2)|Change_network(3)"
128. echo
129. ;;
130. esac
131. done