From owner-freebsd-hackers  Wed Feb 22 12:03:28 1995
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Date: Wed, 22 Feb 1995 14:02:24 -0600
To: Mark Murray <mark@grondar.za>
From: rkw@dataplex.net (Richard Wackerbarth)
Subject: Building /etc
Cc: hackers@FreeBSD.org
Sender: hackers-owner@FreeBSD.org
Precedence: bulk

How about keeping a reference set of files that you change.
/etc/somefile.example

Install procedure:

if exists somefile.example then
    if exists somefile.example.old then
        rm somefile.example
    else
        mv somefile.example somefile.example.old
    end
    install somefile as somefile.example
else
    install somefile as somefile
end

That way somefile.example is a "flag" that somefile has been locally changed.
And somefile.example.old is a "flag" that you need to examine the new changes.

----
Richard Wackerbarth
rkw@dataplex.net