shell按照时间排序，保留最新的10个文件并删除其余文件
#!/bin/sh
basedir=$(cd dirname $0;pwd)
DATE=$(date "+%F %H:%M")
path=/data/ceshi
save_num=5
line=$(ls -l $path|sed 1d|wc -l)
if [ ! $basedir/del_name.log ];then
touch $basedir/del_name.log
fi
echo "--------------------$DATE------------------------" >>$basedir/del_name.log
if [ $save_num -lt $line ];then
echo "----------------delete path is $path-------------------" >>$basedir/del_name.log
ls -t $path|awk "{if(NR>$save_num){print $1}}" >>$basedir/del_name.log
cd $path
ls -t|awk "{if(NR>$save_num){print $1}}"|xargs rm -rf
else
echo "$path wenjian number is ok" >>$basedir/del_name.log
fi

固定格式文件，某个名字的保留几个可以参考下面的：
#!/bin/sh
basedir=$(cd dirname $0;pwd)
DATE=$(date "+%F %H:%M")
path=/opt/app/backup
ls $path|awk -F '-' '{print $1}'|sort -n|uniq -c|sort -nr >$basedir/del_backup.log
while read line
do
lines=$(echo "$line"|awk '{print $1}')
name=$(echo "$line"|awk '{print $2}')
if [ $lines -gt 2 ];then
cd $path
name_all=$(ls -t|grep "$name"|awk '{if(NR>2){print $1}}')
rm -f $name_all
echo "$DATE Deleted:$name_all" >>$basedir/del_backup.log
fi
done < $basedir/del_backup.log