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#!/bin/bash
#保留文件数
ReservedNum=5
FileDir=/data/bak
date=$(date "+%Y%m%d-%H%M%S")
FileNum=$(ls -l $FileDir|grep ^- |wc -l)
while(( $FileNum > $ReservedNum))
do
OldFile=$(ls -rt $FileDir| head -1)
echo $date "Delete File:"$OldFile
rm -rf $FileDir/$OldFile
let "FileNum--"
done