Concurrent Versions System

What is Concurrent Versions System?
Concurrent Versions System (CVS) is an open source software configuration management program that can be used to manage different versions of the same software project in a specialized repository.

Each independent software module is developed and constantly updated for performance as developers discover new and effective ways to improve the efficiency of the software module. CVS maintains different versions of the module so that if a future version has some bugs, an earlier version can be referenced and used.

Software developers have to manage many documents associated with a software project. The process of managing so many resources efficiently is a tedious task. Often a module can be replaced with an improved version that has a more effective algorithm or less dependency on other modules. If the extended module is unsuccessful, the developer has to switch to the old module. Therefore a parallel administration of both modules is necessary. This function can be performed by a repository or a special type of database that can store software-related data. However, it needs to track changes made by each developer and resolve conflicts when multiple developers are working on the same project.

CVS maintains consistency between different files using three concepts. File locking is used to ensure that the file is modified by one person at a time. The same file modified by different people can be monitored using the watch command. The CVS provides appropriate guidelines for combating conflicts between files that have been modified by the same developer. It supports an option to include the changed versions in the same file using appropriate delimiters. CVS provides security through the use of password authentication or Kerberos with generic security services application program interface protocol. Finally, any successful changes can be saved using the Commit command via the command line interface.

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