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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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Updating /etc

The /etc directory contains system and program configuration information. When a program changes, its configuration file might also change. If you try to run a new program with an obsolete configuration file, the program will not run correctly.

You absolutely must update /etc before running your system—arguably the most annoying part of an upgrade. No automated process can possible know how your system should behave. Only you can know that, which means that you must compare the contents of your existing /etc to the same files in a new, stock /etc. OpenBSD provides tools to make the process less annoying.

Before you begin, if your system performs complicated functions, such as a database or packet filtering, boot into single-user ...

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