Linux Shell Utility Small instance

2. Determines whether the current user is the root administrator, and if so, executes the tar to perform a backup of the/etc/directory.

   #!/bin/bash
   # IF Current user was root then backup the/etc
   If ["$ (id-u)"-eq 0];then
   Tar-czf/root/etc.tar.gz/etc &>/dev/null
   Else
   Echo ' Please switch user on root. '
   Exit 9
   Fi
   

4. Ask the user to enter a password to determine if the password is correct.

   #!/bin/bash
   # Read Password and test.
   Read-p "Enter a password:" Password
   If ["$password" = = "Pass"];then
   echo "OK."
   Else
   echo "Your password is wrong."
   Exit 9
   Fi

6. 99 Multiplication Table

   #!/bin/bash
   # 99 Multiplication Table
   For ((i=1;i<=9;i++))
   Do
   For ((j=1;j<=i;j++))
   Do
   Echo-n "$j * $i =$[$i * $j]"
   #printf "%-8s" $j * $i =$ (($i * $j))
   Done
   Echo
   Done

8. Send messages in bulk

   #!/bin/bash
   #批量发送邮件
   Domain=sharelinux.com
   For Mail_u in Tom Allen whistle
   Do
   Mail-s "Log" [Email Protected]${domain} </var/log/message
   Done

10. Print NIC profile information

    #!/bin/bash
    #Read/etc/sysconfig/network-scripts/ifcfg-eth0 and print out.
    
    Line=/etc/sysconfig/network-scripts/ifcfg-eth0
    While Read-r line
    Do
    Echo $line
    Done < $LINE

11. Back up the MySQL database

    #!/bin/bash
    # This scripts is backup MySQL database.
    date=$ (Date +%y-%m-%d)
    Des=/usr/local/src/db_mysql
    mysql_u= "Root" #mysql用户名
    Mysql_p= "" #mysql密码, need to change password
    Mysql_h= "127.0.0.1" #mysql服务器IP
    
    if [!-D $DES];then
    Mkdir-p "$DES"
    Fi
    
    #获取数据库名称列表
    dbs=$ (Mysql-u${mysql_u}-h${mysql_h}-bse ' show databases ')
    #通过循环执行备份所有的MySQL数据库
    For database in $DBS
    Do
    if [! "${database}" = = "Information_schema"];then
    Mysqldump-u$mysql_u-h$mysql_h ${database} |bzip2> "${des}/${database}_${date}_mysql.gz"
    #mysqldump-u$mysql_u-p$mysql_p-h$mysql_h $database |bzip2> "${des}/${database}_${date}_mysql.gz"
    Md5sum ${des}/${database}_${date}_mysql.gz>>${des}/readme.txt
    Else
    :
    Fi
    Done
    
    
    

This article is from the "Sanctuary of Calm" blog, please make sure to keep this source http://mastters.blog.51cto.com/6516495/1532939