this is a necessary security tool :
the goal of an file integrity checker is to show what change on your disk.
it's interesting for 2 purposes :

software management

I you do not use a package manager (such as rpm, on Linux), it is difficult to know what is installed by a software, and to uninstall it properly.
I have a special thought for windows, where dll changes are hidden and often cause problems.

intrusion control

you want to check for troyens ? for viruses ?
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