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One of the strong points about CVS is that it not only lets you retrieve
old versions of specific files, you can collect files (or
directories of files) into "modules" and operate on an entire module
at once. The RCS history files of all modules are kept at a central
place in the file system hierarchy. When someone wants to work an a
certain module he just types cvs checkout malloc which causes the
directory `malloc' to be created and populated with the files that
make up the malloc project.
With cvs tag malloc-1.0 you can give the symbolic tag
malloc-1.0 to all the versions of the file in the malloc module.
Later on, you can do cvs checkout -r malloc-1.0 malloc to
retrieve the files that make up the 1.0 release of malloc. You
can even do things like cvs diff -c -r malloc-1.0 -r malloc-1.5
to get a context diff of all files that have changed between release 1.0
and release 1.5!
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