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CVS labels a single project (set of related files) that it manages as a module. A CVS server stores the modules it manages in its repository. Programmers acquire copies of modules by checking out. The checked-out files serve as a working copy, sandbox or workspace. Changes to the working copy are reflected in the repository by committing them.
Apache Subversion (often abbreviated SVN, after its command name svn) is a version control system distributed as open source under the Apache License. [1] Software developers use Subversion to maintain current and historical versions of files such as source code , web pages, and documentation.
Shared, all developers use the same file system; Client–server, users access a master repository server via a client; typically, a client machine holds only a working copy of a project tree; changes in one working copy are committed to the master repository before becoming available to other users
For source code control, the working copy is instead a copy of all files in a particular revision, generally stored locally on the developer's computer; [note 1] in this case saving the file only changes the working copy, and checking into the repository is a separate step.
copy: Mark specified files to be copied at next commit; merge: Apply the differences between two sources to a working copy path; commit: Record changes in the repository; revert: Restore working copy file from repository; generate bundle file: Create a file that contains a compressed set of changes to a given repository
VisualSVN Server, a commercial and proprietary Subversion server package for Windows operating system. Mindquarry, open-source collaborative software geared towards small and medium-sized workgroups. Polarion ALM for Subversion - web based application lifecycle management platform. RapidSVN, a visual subversion client.
Versioning file systems should not be confused with journaling file systems.Whereas journaling file systems work by keeping a log of the changes made to a file before committing those changes to that file system (and overwriting the prior version), a versioning file system keeps previous copies of a file when saving new changes.
Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.