如何使用bash脚本或任何其他方法定期保留S3存储桶中最新的“N”个文件/对象数

I am using S3 bucket to store my web application log files. Now I need to know is there any option available, to keep the latest 20 files only, regardless when they are created. I can't use S3 auto expiry option as I always need the latest 20 files inside my bucket. I am using S3 bucket to store my web applicatio