cruft is a program to look over your system for anything that shouldn’t be there, but is; or for anything that should be there, but isn’t.

It bases most of its results on dpkg’s database, as well as a list of `extra files’ that can appear during the lifetime of various packages.

Cruft can be a useful tool for debian based systems and can be run with a simple command “cruft”, or if you want to specify any directory or folder, you could use something like this: cruft -d /etc