在Linux中，备份系统的方法有很多，除了使用备份工具外，还能通过shell备份Linux系统，下面小编就给大家分享下备份Linux系统的shell脚本。
脚本如下：
#！/bin/sh
#Automatic Backup Linux System Files
#Author wugk 2013-11-22
#Define Variable
SOURCE_DIR=（
$*
）
TARGET_DIR=/data/backup/
YEAR=`date +%Y`
MonTH=`date +%m`
DAY=`date +%d`
WEEK=`date +%u`
FILES=system_backup.tgz
CODE=$？
if
［ -z “$*” ］;then
echo -e “Please Enter Your Backup Files or Directoriesn--------------------------------------------nExample $0 /boot /etc 。。。。。。”
exit
fi
#Determine Whether the Target Directory Exists
if
［ ！ -d $TARGET_DIR/$YEAR/$MONTH/$DAY ］;then
mkdir -p $TARGET_DIR/$YEAR/$MONTH/$DAY
echo “This $TARGET_DIR is Created Successfully ！”
fi
#EXEC Full_Backup Function Command
Full_Backup（）
{
if
［ “$WEEK” -eq “7” ］;then
rm -rf $TARGET_DIR/snapshot
cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $FILES `echo ${SOURCE_DIR［@］}`
［ “$CODE” == “0” ］&&echo -e “--------------------------------------------nThese Full_Backup System Files Backup Successfully ！”
fi
}
#Perform incremental BACKUP Function Command
Add_Backup（）
{
cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;
if
［ -f $TARGET_DIR/$YEAR/$MONTH/$DAY/$FILES ］;then
read -p “These $FILES Already Exists， overwrite confirmation yes or no ？ ： ” SURE
if ［ $SURE == “no” -o $SURE == “n” ］;then
sleep 1 ;exit 0
fi
#Add_Backup Files System
if
［ $WEEK -ne “7” ］;then
cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $$_$FILES `echo ${SOURCE_DIR［@］}`
［ “$CODE” == “0” ］&&echo -e “-----------------------------------------nThese Add_Backup System Files Backup Successfully ！”
fi
else
if
［ $WEEK -ne “7” ］;then
cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $FILES `echo ${SOURCE_DIR［@］}`
［ “$CODE” == “0” ］&&echo -e “-------------------------------------------nThese Add_Backup System Files Backup Successfully ！”
fi
fi
}
Full_Backup;Add_Backup
上面就是Linux使用shell脚本备份系统的方法介绍了，通过上面的脚本就能自动备份系统，但脚本可能还存在不足的地方，可自行改良优化。
