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To update is to acquire or merge the changes in the repository with the working copy. CVS uses a client–server architecture: a server stores the current version(s) of a project and its history, and clients connect to the server in order to "check out" a complete copy of the project, work on this copy and then later "check in" their changes.
Unstructured merge operates on raw text, typically using lines of text as atomic units. This is what Unix tools (diff/patch) and CVS tools (SVN, Git) use. This is limited [opinion], as a line of text does not represent the structure of source code.
Merge, users may freely edit files, but are informed of possible conflicts upon checking their changes into the repository, whereupon the version control system may merge changes on both sides, or let the user decide when conflicts arise. Distributed version control systems usually use a merge concurrency model.
PVCS Version Manager (originally named Polytron Version Control System) is a software package by Serena Software Inc., for version control of source code files.. PVCS follows the "locking" approach to concurrency control; it has no merge operator built-in (but does, nonetheless, have a separate merge command).
Git does periodic repacking automatically, but manual repacking is also possible with the git gc command. [46] For data integrity, both the packfile and its index have an SHA-1 checksum [47] inside, and the file name of the packfile also contains an SHA-1 checksum. To check the integrity of a repository, run the git fsck command. [48] [49]
To commit a change in git on the command line, assuming git is installed, the following command is run: [1] git commit -m 'commit message' This is also assuming that the files within the current directory have been staged as such: [2] git add . The above command adds all of the files in the working directory to be staged for the git commit.
Further, multiple releases on different operating system platforms may have to be maintained. Branches allow contributors to isolate changes without destabilizing the codebase, for example, fixes for bugs, new features, [3] and versions integration. These changes may be later merged (resynchronized) after testing.
AccuRev is built around a stream-based architecture in which streams form a hierarchical structure of code changes where parent streams pass on certain properties to child streams. Developers make changes using command line functions, the Java GUI, the web interface, or one of the IDE plug-ins (Eclipse, Visual Studio, IntelliJ IDEA). [6]