Creating a new branch
$ cvs rtag -b -r branchname module
That branch may now be checked out with
$ cvs checkout -r branchname module
Any changes in the working copy of a branch will not affect the main tree.
Merging a branch into the current trunk
$ cvs update -j branchname
Will join branchname into the current checkout
Merging differences
$ cvs update -j revision -j revision
will merge the difference between the two revisions into the current
working copy.
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