Practical shell compiling case

1. you can set the number of servers to be checked and the server to check. You can set the IP address of the non-Online host and the corresponding time of the non-Online host, and collect statistics on the number of non-Online hosts saved to the file. Then, the file content is displayed on the screen.

1 #! /Bin/bash 2 read-P "Enter the number of detection servers:" x 3 S = 0 4 B = 0 5 for (I = 1; I <= X; I ++) 6 do 7 read-P "Enter the address of the host to be checked. after entering the address, please wait:" IP [$ I] 8 9 Ping-C 1 192.168.1. $ {IP [$ I]} &>/dev/null 10 if [$? -Ne 0] 11 then 12 Date>/root/Shell/offline.txt 13 echo "IP: 192.168.1. $ {IP [$ I]} is offline ">/root/Shell/offline.txt 14 Let s ++ 15 else echo" 192.168.1. $ {IP [$ I]} is online "16 fi 17 done 18 19 echo" Number of disconnections this time: "$ S>/root/Shell/offline.txt 20 tail-10/root/Shell/offline.txt

2. Write a STARTUP script for the source code HTTP service

 

  1 #! /bin/bash  2 # chkconfig: 2345 75 25  3 # description: apache http  4 # processname: httpd  5 path="/usr/local/httpd/bin/apachectl"  6 case $1 in  7 start)  8     $path start &> /dev/null  9     sleep 1 10     echo -n "apache is start..ok";; 11 stop) 12     $path stop 13     sleep 2 14     echo -n "apache is stop..ok";; 15 restart) 16     $path stop 17     echo -n "apache is stop..ok" 18     sleep 3 19     $path start 20     echo -n "apache is start..ok";; 21 status) 22     netstat -anptu | grep httpd$ 23     if [ $? -eq 0 ];then 24     echo "apache is runing" 25     else echo "apache is not run" 26     fi;; 27 *) 28     echo "apache {start/stop/restart/status}" 29 esac 30 echo

3. When the system root partition can have less than 15 GB space, send a warning message "insufficient disk space for the root partition" to all terminals of the system"

1 #! /Bin/bash 2 I = 'df-H | grep/$ | awk '{print $4}' | awk-F "G" '{print $1} ''' 3 if [$ I-lt 15]; then 4 wall "root partition available space $ I g, insufficient space" 5 fi

4. When adding a user, you can set the number of users to be added, username prefix, user password, and user validity period.

1 #! /Bin/bash 2 read-P "Enter the number of users" count 3 read-P "Enter the username prefix" user 4 read-P "username and password" passwd 5 read-P" validity Period "Shi 6 S = 85 7 for (I = $ S; I <= $ S + $ count-1; I ++) 8 do 9 if [$ I-lt 10]; then 10 useradd "$ user" 0 $ I 11 echo "$ passwd" | passwd -- stdin "$ user" 0 $ I &>/dev/null 12 chage-D 0 "$ user "0 $ I 13 chage-M $ Shi" $ user "0 $ I 14 else 15 useradd $ user $ I 16 echo" $ passwd "| passwd -- stdin $ user $ I &>/dev/null 17 chage-D 0 $ user $ I 18 chage-M $ Shi $ user $ I 19 fi 20 done

5. Run the script on the slave server in MySQL master-slave synchronization to monitor the status of the IO and SQL processes. When a process is in the no status, send a warning message to the terminal.

  1 #! /bin/bash  2 a=`mysql -uroot -p123456 -e "show slave status\G"|grep -iE "*io_runing"|awk ‘{print $2}‘`  3 b=`mysql -uroot -p123456 -e "show slave status\G"|grep -iE "*sql_runing"|awk ‘{print $2}‘`  4 while :  5 do  6         if [ $a = "NO" -o $b = "NO" ];then  7         wall "mysql runing_status is NO"  8         fi  9 done

6. Practical Regular Expression

Mac :( [0-9a-fa-f] {2} :) {5} [0-9a-fa-f] {2} IP :( [0-9] | [1-9] [0-9] | 1 [0 -9] {2} | 2 [0-4] [0-9] | 25 [0-5] \.) {3} [0-9] | [1-9] [0-9] | 1 [0-9] {2} | 2 [0-4] [0-9] | 25 [0-5]

This article is from the "sleepcat" blog, please be sure to keep this source http://sw5720.blog.51cto.com/8812314/1437602