#!/bin/bash

#保留文件数
ReservedNum=7
FileDir="/data/bak /data/bak2"
date=$(date "+%Y%m%d-%H%M%S")


for i in $FileDir
do
FileNum=$(ls -l $i|grep ^d |wc -l)
	while(( $FileNum > $ReservedNum))
	do
    		OldFile=$(ls -rt $i| head -1)
    		echo  $date "Delete File:"$OldFile
    		rm -rf $i/$OldFile
    		let "FileNum--"
	done

done