Cfengine is not a tool, it is an environment for managing
host configuration and integrity. In this article it has only
been possible to scratch the surface of what cfengine can do.
To fully understand the syntax of the examples here you should
read the documentation for cfengine.
The big advantage of cfengine over many other configuration schemes is
that you can have *everything* in one file (or set of files). The
global file is common to every host and yet it can be as general or as
specific as you want it to be. You can use it as a
front end for cron, and you can use its advanced features to make your
hosts *converge* to a desired, correct state.