"This document describes how to install chkrootkit and
portsentry. It should work (maybe with slight changes concerning
paths etc.) on all *nix operating systems.
"Chkrootkit 'is a tool to locally check for signs of a
"'The Sentry tools provide host-level security services for the
Unix platform. PortSentry, Logcheck/LogSentry, and HostSentry
protect against portscans, automate log file auditing, and detect
suspicious login activity on a continuous basis...'"