Linux Shell 自动备份脚本

写一个使用shell脚本增量备份系统文件，顺便复习一下shell脚本相关的命令，这个脚本可以根据自己的需求来备份不同的文件或者文件夹，进行完整备份和增量备份。

参考的网址：http://blog.51cto.com/wgkgood/1330200

直接上脚本如下：

 #########################################################################
 # File Name: back_template.sh
 # Author: happy
 # mail: zaqwsx526@.com
 # Created Time: Wed  Jun  :: PM CST
 #########################################################################
 #!/bin/bash
 SOURCE_DIR=(
     $*
     )
 TARGET_DIR=/backup/data/
 YEAR=`date +%Y`
 MONTH=`date +%m`
 DAY=`date +%d`
 WEEK=`date +%u`
 FILES=system_backup.tgz
 CODE=$?
 if [ -z "$*" ];then
     echo -e "Please Enter Your Backup Files or Directories\n--------------------------------------------\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 "" ];then
         rm -rf $TARGET_DIR/snapshot
         cd $TARGET_DIR/$YEAR/$MONTH/$DAY
         tar -g $TARGET_DIR/snapshot -czvf $FILES `echo ${SOURCE_DIR[@]}`
         [ "$CODE" == "" ]&&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  ;exit
         fi
         #Add_Backup Files System
         if [ $WEEK -ne "" ];then
             cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $$_$FILES `echo ${SOURCE_DIR[@]}`
             [ "$CODE" == "" ]&&echo -e  "-----------------------------------------\nThese Add_Backup System Files Backup Successfully !"
         fi
     else
         if [ $WEEK -ne "" ];then
             cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $FILES `echo ${SOURCE_DIR[@]}`
             [ "$CODE" == "" ]&&echo -e  "-------------------------------------------\nThese Add_Backup System Files Backup Successfully !"
         fi
     fi
 }
 Full_Backup;Add_Backup