linux shell 实用小实例

1. 判断当前用户是否为root管理员，如果是，则执行tar对/etc/目录执行备份.

   #!/bin/bash
   # IF current user is 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
   

2. 要求用户输入密码，判断密码是否正确.

   #!/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

3. 九九乘法表

   #!/bin/bash
   # 九九乘法表
   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

4. 批量发送邮件

   #!/bin/bash
   #批量发送邮件
   DOMAIN=sharelinux.com
   for MAIL_U in tom allen whistle
   do
       mail -s "Log" $MAIL_U@${DOMAIN} </var/log/message
   done

5. 打印网卡配置文件信息

   #!/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

6. 备份MySQL数据库

   #!/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，需要修改密码
   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
   
   
   

本文出自 “心静梵音” 博客，请务必保留此出处http://mastters.blog.51cto.com/6516495/1532939

linux shell 实用小实例,古老的榕树,5-wow.com