A lightweight and simple HIDS (Host-based Intrusion Detection System) written in Bash
Example image of a sids check output.
sids creates a database of files (with the -i option) specfied in the configuration file. This database stores hashes, permissions, and ownership data for each monitored file. Later, via the -c option, it checks the current status of each monitored file against the data stored in the database. If something do not match, sids will let you know, as shown in the image above.