What is it?
HnTool is an open source (GPLv2) hardening tool for Unix. It scans your system for vulnerabilities or problems in configuration files.
To use HnTool download it and run:
# ./hntool
For more information (and options) you can check HnTool's manual page by typing "man hntool" at the command line or see the usage help:
$ hntool -h