MD5mon is a file monitor that verifies files by computing their checksums. The shell script is suitable for use as a basic security checking tool from cron. It features configurable monitoring levels, local copies of find/md5sum, and integrity checks to prevent tampering with itself. It can also use a more secure shasum instead of md5sum.
You can download it from the following link: https://packetstormsecurity.com/files/download/24354/md5mon-1.3a.tar.gz
Source: https://packetstormsecurity.com/files/24354/md5mon-1.3a.tar.gz.html