Updating Your Source Tree
After you have decided which version of FreeBSD you want to update to (which is probably STABLE), you need to prepare your system for the update. The first thing you need to do is cvsup your existing FreeBSD source tree so that it matches the source tree of either STABLE or CURRENT. For the rest of this hour, we are going to assume that you are updating to STABLE.
What Is cvsup?
cvsup is a client program that works with the CVS system. CVS is basically a system for managing the source code of programming projects. The cvsup program will connect to one of the FreeBSD servers that contains the most recent source code for STABLE, and it will compare each source code file on your system with the same file on the server. ...
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