Updating Important Files
In some cases, certain configuration files might need to be updated before the system upgrade is actually performed because certain new versions of FreeBSD might expect, for example, certain user accounts or groups to exist for system purposes. If these groups and accounts did not exist in earlier versions of FreeBSD, the update process can fail.
The easiest way to upgrade these files is to use the program called mergemaster.sh. Start it with the –p option so that it only updates files that are important to the pre-upgrade. You don't want to update the rest of the files yet. For example,
mergemaster.sh –p
 | It's very important ... |
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