对不断增长的文件进行增量备份_时间命名_取随机数命名

#!/bin/bash

export PATH=/bin:/sbin:/usr/bin:/usr/sbin:$PATH

BK_HOME=/backup
MEDIA_HOME=/home/web/media
SNAPSHOT=`ls /backup/ |grep snapshot |wc -l`
TFILE=`ls /home/web/media |wc -l`

if [ "$TFILE" == 0 ]
  then
   echo "There is no media file exist."
else
 if [ "$SNAPSHOT" != 0 ]
   then
   echo "-------------------------------------`date +%Y%m%d`----------------------------------"
   echo "Now we compress media files."
   tar -g $BK_HOME/snapshot -zcvpf $BK_HOME/image`date +%Y%m%d`_$RANDOM.tar.gz /home/web/media >/dev/null 2>&1
  else
   echo "--------------------------------------`date +%Y%m%d`----------------------------------">>$BK_HOME/err.log
   echo "There is no snapshot or it was deleted.\n" >>$BK_HOME/err.log
   echo "Rebuild snapshot and full backup media files.\n">>$BK_HOME/err.log
   tar -g $BK_HOME/snapshot -zcvpf $BK_HOME/image`date +%Y%m%d`_full_$RANDOM.tar.gz /home/web/media /dev/null 2>&1
 fi
fi

 

注意：红颜色标出的变量即可生成随机数

 

增量备份命名使用时间点：touch test`date +%Y.%m.%d_%H:%M:%S`