sysctl(3) man page examples

[Sean Bruno]

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sysctl(3) specifies three easy to understand examples.

The first appears to depend on a FreeBSD libc() function or library that
is missing, "printkproc()".  Is this a deprecated/deleted function from
the past?

The second example works just fine.

The third accesss user.cs_path which seems to be empty across all
platforms.  I'm not sure if we should replace this example with
something more meaningful(that is to say that its proper for
user.cs_path to be empty) or if there is a bug causing user.cs_path to
be empty.

sean
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