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(cvsbook.info)Branches

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Branches
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We've been viewing CVS as a kind of intelligent, coordinating library.
However, it can also be thought of as a time machine (thanks to Jim
Blandy for the analogy).  So far, we've only seen how you can examine
the past with CVS, without affecting anything.  Like all good time
machines, CVS also allows you to go back in time to change the past.
What do you get then? Science fiction fans know the answer to that
question: an alternate universe, running parallel to ours, but diverging
from ours at exactly the point where the past was changed.  A CVS branch
splits a project's development into separate, parallel histories.
Changes made on one branch do not affect the other.

Branching Basics

Merging Changes From Branch To Trunk

Multiple Merges

Creating A Tag Or Branch Without A Working Copy