[root@scm-dzm testfolder]# ll
total 4 drwxr-xr-x. 2 root root 6 Jul 14 00:53 20160722 drwxr-xr-x. 2 root root 6 Jul 14 00:53 20160723 drwxr-xr-x. 2 root root 6 Jul 14 00:53 20160724 drwxr-xr-x. 2 root root 6 Jul 14 00:45 20160725 drwxr-xr-x. 2 root root 6 Jul 14 00:45 20160726 drwxr-xr-x. 2 root root 6 Jul 14 00:45 20160727 -rwxr-xr-x. 1 root root 470 Jul 14 00:44 delfolder.sh
[root@scm-dzm testfolder]# cat delfolder.sh
#!/bin/bash
# rm the backup files on 3days ago
backupfolder=/root/testfolder/
cd $backupfolder
statistics()
{
folderlist=`ls $backupfolder| tr ' ' '\n'|egrep '[0-9]{8}' |sort -n`
backupnum=`echo $folderlist | tr ' ' '\n'| wc -l `
echo " backupnum = $backupnum"
}
statistics
while [ $backupnum -gt 3 ]
do
dellist=${folderlist:0:9}
echo "dellist = $dellist"
rm -rf $backupfolder$dellist
statistics
done
[root@scm-dzm testfolder]# ./delfolder.sh
backupnum = 6 dellist = 20160722 20160722 backupnum = 5 dellist = 20160723 20160723 backupnum = 4 dellist = 20160724 20160724 backupnum = 3
[root@scm-dzm testfolder]# ll
total 4 drwxr-xr-x. 2 root root 6 Jul 14 00:45 20160725 drwxr-xr-x. 2 root root 6 Jul 14 00:45 20160726 drwxr-xr-x. 2 root root 6 Jul 14 00:45 20160727 -rwxr-xr-x. 1 root root 470 Jul 14 00:44 delfolder.sh
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