各个系统每天完全备份一次，备份文件是按照日期命名。不同系统的备份文件放在不同的目录，同一个系统每天不同的备份放在同一个目录。
所以需要每天清理一个备份文件。因此写了一个shell脚本，每天执行一次。
脚本程序的工作思路是：
0、读取目标目录中的文件，如果没有今天的备份文件，不处理并且打印报告。
1、读取目标目录中的文件数目，少于等于3个就不处理，并且打印报告。如果多于3个，执行第2步。
2、比较文件大小，如果3天前的备份文件大小大于2天前的备份文件大小，不处理并且打印报告。如果3天前的备份文件小于或等于2天前的文件，则删除3天前的备份文件。
3、读取目录下文件数目，并且打印。
4、所有的目标目录都执行一遍上面的程序。
#!/bin/bash
path[1]="/home/confluence/"
path[2]="/home/database/mms"
path[3]="/home/database/oa"
path[4]="/home/mms/"
path[5]="/home/svn/jira"
path[6]="/home/svn/jira_attach"
path[7]="/home/svn/jira_mysql"
path[8]="/home/svn/svn"
today=`date +%Y-%m-%d`
date_2day_ago=`date -d -2day +%Y-%m-%d`
date_3day_ago=`date -d -3day +%Y-%m-%d`
echo today is $today
for((i=1;i<=8;i++))
do
echo " " #start_1
function size_compare {
if [ -f ${path[i]}/*$date_3day_ago* ];then #path
echo ${path[i]}/*$date_3day_ago* OK! #path
else
echo ${path[i]}/*$date_3day_ago* not exist! #path
continue
fi
name=`ls ${path[i]}/*$date_3day_ago*` #path
#echo The will delete file name is $name
if [ -f ${path[i]}/*$date_2day_ago* ];then #path
echo ${path[i]}/*$date_2day_ago* OK! #path
else
echo ${path[i]}/*$date_2day_ago* not exist! #path
continue
fi
name1=`ls ${path[i]}/*$date_2day_ago*` #path
#echo it will compare the size with $name1
NAME=`ls -l $name |awk '{print $9}'`
SIZE=`ls -l $name |awk '{print $5}'`
NAME1=`ls -l $name1 |awk '{print $9}'`
SIZE1=`ls -l $name1 |awk '{print $5}'`
echo $NAME size is $SIZE
echo $NAME1 size is $SIZE1
if [ $SIZE -le $SIZE1 ]；then
` rm -f $NAME`
echo $NAME Delete Successful!
else
echo sizebad!
fi
}
############ today backup file exist or not!#####################
if [ -f ${path[i]}/*$today* ];then #path
echo today ${path[i]}/*$today* exist! #path
else
echo Today ${path[i]}/*$today* not exist! #path
continue
fi
numbers=`find ${path[i]} -type f |wc -l` #path
if [ $numbers -ge 4 ]；then
echo ${path[i]} have $numbers more than 3! #path
size_compare #continue
else
echo ${path[i]} numbers less 4! #warning
fi
done #end_1
echo " "
for ((i=1;i<=8;i++)) #start_2
do
#test=`ll |grep ".sql$" |wc -l`
numbers=`find ${path[i]} -type f |wc -l`
#echo There are $numbers files in the current directory!
echo ${path[i]} have $numbers files
done #end_2
echo " "
echo " "
#ls -l /home/src/ |sed '1d'| awk '{print $5 "\t" $9}' > a.txt
#sed -n '2p' a.txt
#size=`sed -n '2p' a.txt |awk '{print $1}'`
#name=`sed -n '2p' a.txt |awk '{print $2}'`
#echo $name $size
#rm -f a.txt
