Shell Script--Script analysis of System file backup

The main command for the following script is:

CD $TARGET _dir/$YEAR/$MONTH/$DAY; tar-g $TARGET _dir/snapshot-czvf $FILES ${source_dir[@]} # #创建好的备份目录中, execute backup command, Here is an example of a complete command:

Tar-g/tmp/snapshot-czvf/tmp/2017_full_sysbak.tar.gz/data/sh # #第一次创建快照完整备份, compress the/data/sh directory into/tmp/and save as 2017_full_sysbak.tar.gz, if the file under/data/sh is increased, we will make an incremental backup as follows:

tar-g/tmp/snapshot-czvf/tmp/2017_add_sysbak.tar.gz/data/sh/ ----Use the original snapshot incremental backup again, just back up the part of the file that was added

The following script is to implement a canonical backup that can be added to the crontab to be executed every night in the morning, for example:

Crontab-e

0 0 * * */bin/bash/data/sh/toolscript/auto_system_backup.sh/var/log/>>/tmp/backup.log # # #每天凌晨执行备份日志目录并追加相 Shut down log information

-----------------------------Script Auto_system_ Backup.sh---------------------------------------------------------------------------------

#!/bin/bash

#automatic Backup Linux system files

#author Robin 2017-4-4

#define Variable # #参数定义

Source_dir= ($*) # #以数组的形式存放需要备份的目录, you need to specify manually when executing the script

target_dir=/data/backup/ # #指定备份路径

Year= ' Date +%y ' # #年参数, these are used to create a hierarchical directory

Month= ' Date +%m ' # #月参数

day= ' Date +%d ' # #日参数

week= ' Date +%u ' # #星期参数

A_name= ' Date +%h%m ' # #时分参数

Files=${a_name}_system_backup.tgz # #定义压缩文件格式, can also be compressed into other formats such as tar.gz

Code=$? # #判断是否有错

#Juge the Inter file exist # # #这里首先要判断在执行脚本时有没有指定参数, which is the directory to be backed up

If [-Z ' $* '];then #如果没有指定参数则提示你

Echo-e "\033[32musage:\nplease Enter Your Backup Files or directories\n-------------------------------\n\nusage: {$0/b OOT/ETC} \033[0m " # #提示信息

Exit

Fi

#Determine Whether the Target Directory Exists # #注释信息

if [!-D $TARGET _dir/$YEAR/$MONTH/$DAY];then # #判断当天的备份目录是否存在

Mkdir-p $TARGET _dir/$YEAR/$MONTH/$DAY # #创建该目录

Echo-e "\033[32mthe $TARGET _dir Created successfully! \033[0m " # #提示信息

#EXEC full_backup Function Command # #提示以下是完整备份函数

Full_backup ()

{

If ["$WEEK"-eq "7"];then # #这里指定的是周末进行完整备份

RM-RF $TARGET _dir/snapshot # #首先删除掉原有本分目录下的快照

CD $TARGET _dir/$YEAR/$MONTH/$DAY; tar-g $TARGET _dir/snapshot-czvf $FILES ${source_dir[@]} # #这里就是完整备份的命令, explain ${ Source_dir[@]}, this is what you need to specify one or more directories that need to be backed up, in the form of arrays, for example:sh/date/auto_backup.sh/etc/home

["$CODE" = = "0"]&&echo-e "----------------------------\n\033[32mthese full_backup System Files Backup SUCCESSF Ully!\033[0m " # #提示信息, indicates that the prompt message indicates success if none of the above commands are present. The following function is also the same

Fi

}

#Perform incremental Bacpup Function Command # #提示下面是增量更新的函数

Add_backup ()

{

If ["$WEEK"-ne "7"];then # #这里指定的是除开周末则进行增量更新

CD $TARGET _dir/$YEAR/$MONTH/$DAY; tar-g $TARGET _dir/snapshot-czvf update$files ${source_dir[@]} # # The difference between this statement and the one above is the backup name.

["$CODE" = = "0"]&&echo-e "----------------------------\n\033[32mthese full_backup System Files $TARGET _dir/$ year/$MONTH/$DAY/${year}_$a_name$files Backup successfully!\033[0m " # #也是提示信息

Fi

}

Sleep 3 # #延时3秒在继续以下动作

Full_backup; Add_backup ##调用函数, the execution order of the code is the last execution of the function, first two judgment statements are executed before the function processing

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The following is my test information:

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The last hint is that the incremental update succeeds, and if you want to make a full update, you can modify the system time to Sunday, or modify the ["$WEEK"-eq "7"] in your code to the time of your current system before executing the script.

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You can see the backup file in/09/0002_system_backup.tgz full backup for weekend 9th, incremental backup of 04/UPDATE1549_SYSTEM_BACKUP.TGZ week 24th

Note: The above script can be changed according to your actual needs, to achieve more features.

This article is from "The SED of linux command" blog, declined reprint!

Shell Script--Script analysis of System file backup