After reading cron.weekly a few weeks ago, I was intrigued by binsnitch.py, a tool that creates a baseline file with the md5/sha256/… hash of every file you wish to monitor. In case you think you have a virus, malware or cryptovirus you can verify easely what files have been changed. This is kinda fun, the sad part is, it uses Python, and requires python >= 3 which restricts the use on Centos (python 2 default). I dislike a unneeded dependency like that on my servers. So I wrote a quick and dirty alternative to it. Only requirements are bash and md5sum (or if you wish some other sum tool such as sha256sum) which I believe are common on every Linux server.
You can download & adapt it here.