十九、编写简单脚本之备份

数据备份脚本的编写

再复杂的脚本也都是按着顺序一步一步来的,要学会脚本的书写步骤。

创建归档的命令tar

-z 压缩

-c 创建

-f 跟归档文件名

[root@tzPC 24Unit]# tar -cf root.tar /root/script/*
tar: Removing leading `/' from member names
#tar会将绝对路径改为相对路径,这样使归档文件能解压到任何地方
tar: /root/script/24Unit/root.tar: file is the archive; not dumped
#root.tar是存档文件,不能删除

注意加z跟不加z选项的文件后缀名的区别

[root@tzPC 24Unit]# tar -zcf root.tar.gz /root/script/*
tar: Removing leading `/' from member names
tar: /root/script/24Unit/root.tar.gz: file changed as we read it

不解压直接查看tar包内容

[root@tzPC 24Unit]# tar tvf tz.tar

注意:如果使用的是带图形化界面的发行版,$HOME目录中会含有很多跟图形化有关的配置文件跟临时文件,这些我们并不需要,归档时最好选择需要归档的文件放入单独的目录

打包隐藏文件

[root@tzPC 24Unit]# tar rf tz_bash.tar /home/tz/.bash_profile 
tar: Removing leading `/' from member names
[root@tzPC 24Unit]# tar tf tz_bash.tar 
home/tz/.bash_profile

打包隐藏文件目录

[root@tzPC 24Unit]# tar zcf tz_home.tar.gz /home/tz
tar: Removing leading `/' from member names
[root@tzPC 24Unit]# tar tf tz_home.tar.gz 
home/tz/
home/tz/.bash_logout
home/tz/.bash_profile
home/tz/.bashrc
home/tz/.bash_history

排除打包文件目录script

[root@tzPC 24Unit]# tar cvf tz_home.tar --exclude script

编写需要打包的文件或目录

[root@tzPC 24Unit]# cat Files_To_Backup 
/root/script/20Unit
/root/script/21Unit
/root/script/19Unit
/root/temp_script

使用exec命令重定向标准输入STDIN

exec < $CONFIG_FILE
read FILE_NAME

只要FILE_NAME文件中有文件可读,其返回状态码就为0,可使用$?获取

while [ $? -eq 0 ]
do
[...]
read FILE_NAME
done

判断文件或目录是否存在,输出不存在目录或文件那一行行号

if [ -f $FILE_NAME -o -d $FILE_NAME ]
then
    #If file exists, add its name to the list.
    FILE_LIST="$FILE_LIST $FILE_NAME"
else
    #If file doesn't exist, issue warning 发出警告
    echo
    echo "$FILE_NAME, does not exist."
    echo "Obviously, I will not include it in this archive."
    #显然,我将不会包含它在这个归档中
    echo "It is listed on line $FILE_NO of the config file."
    echo "Continuing to build archive list..."
    echo
fi
    FILE_NO=$[$FILE_NO + 1]
    #Increase Line/File number by one.
    #行/文件数目增加一

授予用户访问权限

[root@tzPC 24Unit]# mkdir /archive
[root@tzPC 24Unit]# ls -ld /archive/
drwxr-xr-x. 2 root root 6 Sep  4 22:22 /archive/
#创建一个用于存放备份文件的目录

[root@tzPC 24Unit]# mv Files_To_Backup /archive/
[root@tzPC 24Unit]# groupadd Archivers
[root@tzPC 24Unit]# chgrp Archivers /archive
[root@tzPC 24Unit]# ls -ld /archive/
drwxr-xr-x. 2 root Archivers 29 Sep  4 22:22 /archive/
#备份目录属于Archivers组,方便该组成员查看使用目录下的文件

[root@tzPC 24Unit]# useradd Christine
[root@tzPC 24Unit]# usermod -aG Archivers Christine
[root@tzPC 24Unit]# chmod 775 /archive
[root@tzPC 24Unit]# ls -ld /archive/
drwxrwxr-x. 2 root Archivers 29 Sep  4 22:22 /archive/
#创建用户Christine,且还用户属于Christine组,赋予该目录权限

可以将目录的粘滞位加上

对文件按日期归档命名

DATE=$(date +%y%m%d)
#Set Archive File Name 设置归档文件名称
FILE=archive$DATE.tar.gz
#Set Configuration and Destination File 设置配置跟目标文件
CONFIG_FILE=/archive/Files_To_Backup
DESTINATION=/archive/$FILE

整个配置脚本整体如下

[root@tzPC 24Unit]# cat Daily_archive.sh 
#!/bin/bash

#Daily_Archive - Archive designated files & directories
#日常归档-归档指定的文件和目录

#Gather Current Date
#收集当前日期

DATE=$(date +%y%m%d)
#Set Archive File Name 设置归档文件名称
FILE=archive$DATE.tar.gz
#Set Configuration and Destination File 设置配置跟目标文件
CONFIG_FILE=/archive/Files_To_Backup
DESTINATION=/archive/$FILE

#Main Script

#Check Backup Config file exists

if [ -f $CONFIG_FILE ] #Make sure the config file still仍然 exists
then    #if it exists, do nothing but continue on.
    echo 
else    #if it doesn't exist, issue error & exit script.
    echo
    echo "$CONFIG_FILE does not exist."
    echo "Backup not completed due to missing Configuration File" #due to 由于
    echo
    exit
fi

#Build the names of all the files to backup
#建立所有要备份的文件名称

FILE_NO=1    #Start on Line 1 of Config File.
exec < $CONFIG_FILE #Redirect Std Input to name of Config File重定向标准输入到配置文件名称
read FILE_NAME    #Read lst record 阅读第一条记录

while [ $? -eq 0 ]
do
    #Make sure the file or directory exists.
if [ -f $FILE_NAME -o -d $FILE_NAME ]
then
    #If file exists, add its name to the list.
    FILE_LIST="$FILE_LIST $FILE_NAME"
else
    #If file doesn't exist, issue warning 发出警告
    echo
    echo "$FILE_NAME, does not exist."
    echo "Obviously, I will not include it in this archive."
    #显然,我将不会包含它在这个归档中
    echo "It is listed on line $FILE_NO of the config file."
    echo "Continuing to build archive list..."
    echo
fi
    FILE_NO=$[$FILE_NO + 1]
    #Increase Line/File number by one.
    #行/文件数目增加一
    read FILE_NAME    #Read next record.
done

#Backup the files and Compress压缩 Archive

echo "Starting archive..."
echo
tar -czf $DESTINATION $FILE_LIST 2>/dev/null

echo "Archive completed"
echo "Resulting archive file is :$DESTINATION"
echo

exit
View Code

执行效果如下

[root@tzPC 24Unit]# bash Daily_archive.sh 

Starting archive...

Archive completed
Resulting archive file is :/archive/archive200904.tar.gz

 创建按小时归档的脚本

要求:以/archive/hourly主目录为准,其子目录为每个月份,每个月份目录包含每天,每天目录里包含每小时的备份文件。

给用户添加权限

[root@tzPC 24Unit]# mkdir /archive/hourly
[root@tzPC 24Unit]# chgrp Archivers /archive/hourly
[root@tzPC 24Unit]# ls -ld /archive/hourly/
drwxr-xr-x. 2 root Archivers 6 Sep  4 23:11 /archive/hourly/

[root@tzPC 24Unit]# chmod 775 /archive/hourly
[root@tzPC 24Unit]# ls -ld /archive/hourly
drwxrwxr-x. 2 root Archivers 6 Sep  4 23:11 /archive/hourly

编写要归档的目录

[root@tzPC 24Unit]# cat Files_To_Backup 
/root/script/20Unit
/root/script/21Unit
/root/script/19Unit
/root/temp_script

移动目录到/archive/hourly/

[root@tzPC 24Unit]# mv Files_To_Backup /archive/hourly/

脚本整体如下

[root@tzPC 24Unit]# cat Hourly_Archive.sh 
#!/bin/bash
#Hourly_Archive - Every hour create an archive
#set Configuration File
CONFIG_FILE=/archive/hourly/Files_To_Backup
#Set Base Archive Destination Location位置
BASEDEST=/archive/hourly
#Gather收集 Current Day,Month &Time
DAY=$(date +%d)
MONTH=$(date +%m)
TIME=$(date +%k%M)
#Create Archive Destination Directory
mkdir -p $BASEDEST/$MONTH/$DAY
#Build Archive Destination File Name
DESTINATION=$BASEDEST/$MONTH/$DAY/archive$TIME.tar.gz
#Main Script
#[主体本分参见Daily_archive.sh]

 学习来自:《Linux命令行与Shell脚本大全 第3版》第24章

posted @ 2020-09-04 15:07  努力吧阿团  阅读(433)  评论(0编辑  收藏  举报