Interleaved Deltas

	Interleaved Deltas Interleaved deltas, or SCCS weave is a method used by the Source Code Control System to store all revisions of a file. All lines from all revisions are "woven" together in a single block of data, with interspersed control instructions indicating which lines are included in which revisions of the file. Interleaved deltas are traditionally implemented with line oriented text files in mind, although nothing prevents the method from being applied to binary files as well. Interleaved deltas were first implemented by Marc Rochkind in the SCCS in 1975. Its design makes all versions available at the same time, so that it takes the same time to retrieve any revision. It also contains sufficient information to identify the author of each line (blaming) in one block. On the other hand, because all revisions for a file are parsed, every operation grows slower as more revisions are added. The term ''interleaved delta'' was coined later in 1982 by Walter F. Tichy, author of the Revision Control ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Source Code Control System Source Code Control System (SCCS) is a version control system designed to track changes in source code and other text files during the development of a piece of software. This allows the user to retrieve any of the previous versions of the original source code and the changes which are stored. It was originally developed at Bell Labs beginning in late 1972 by Marc Rochkind for an IBM System/370 computer running OS/360. A characteristic feature of SCCS is the ''sccsid'' string that is embedded into source code, and automatically updated by SCCS for each revision. This example illustrates its use in the C programming language: static char sccsid[] = "@(#)ls.c 8.1 (Berkeley) 6/11/93"; This String (computer science), string contains the file name, date, and can also contain a comment. After compilation, the string can be found in binary and object files by looking for the pattern @(#) and can be used to determine which source code files were used during compilation. The what ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Marc Rochkind Marc J. Rochkind invented the Source Code Control System while working at Bell Labs Nokia Bell Labs, originally named Bell Telephone Laboratories (1925–1984), then AT&T Bell Laboratories (1984–1996) and Bell Labs Innovations (1996–2007), is an American industrial research and scientific development company owned by mul ..., as well as writinAdvanced UNIX Programming and founding XVT Software, Inc."An extensible virtual toolkit (XVT) for portable GUI applications," Compcon Spring '92. Thirty-Seventh IEEE Computer Society International Conference, https://ieeexplore.ieee.org/document/186760 References External links Marc Rochkind's web site American computer scientists Unix people Living people Year of birth missing (living people) Place of birth missing (living people) {{compu-bio-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Walter F Walter may refer to: People * Walter (name), both a surname and a given name * Little Walter, American blues harmonica player Marion Walter Jacobs (1930–1968) * Gunther (wrestler), Austrian professional wrestler and trainer Walter Hahn (born 1987), who previously wrestled as "Walter" * Walter, standard author abbreviation for Thomas Walter (botanist) ( – 1789) Companies * American Chocolate, later called Walter, an American automobile manufactured from 1902 to 1906 * Walter Energy, a metallurgical coal producer for the global steel industry * Walter Aircraft Engines, Czech manufacturer of aero-engines Films and television * ''Walter'' (1982 film), a British television drama film * Walter Vetrivel, a 1993 Tamil crime drama film * ''Walter'' (2014 film), a British television crime drama * ''Walter'' (2015 film), an American comedy-drama film * ''Walter'' (2020 film), an Indian crime drama film * ''WALTER'', a 1984 pilot for a spin-off of the TV series ''MASH'' * ''W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Revision Control System Revision Control System (RCS) is an early implementation of a version control system (VCS). It is a set of UNIX commands that allow multiple users to develop and maintain program code or documents. With RCS, users can make their own revisions of a document, commit changes, and merge them. RCS was originally developed for programs but is also useful for text documents or configuration files that are frequently revised. History Development RCS was first released in 1982 by Walter F. Tichy at Purdue University. It was an alternative tool to the then-popular Source Code Control System (SCCS) which was nearly the first version control software tool (developed in 1972 by early Unix developers). RCS is currently maintained by the GNU Project. An innovation in RCS is the adoption of ''reverse deltas''. Instead of storing every revision in a file like SCCS does with interleaved deltas, RCS stores a set of edit instructions to go back to an earlier version of the file. Tichy claims t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Sun WorkShop TeamWare Sun WorkShop TeamWare (later Forte TeamWare, then Forte Code Management Software) is a distributed source code revision control system made by Sun Microsystems. It was first announced in November 1992 as SPARCworks/TeamWare and ProWorks/TeamWare and made commercially available in 1993. Last available as part of the Forte Developer 6 update 2 product, TeamWare is no longer being offered for sale, and is not part of the Sun Studio product. TeamWare's largest deployment was inside Sun itself, where (bar a few exceptions) at one point it was the only VCS used. TeamWare had been used to manage Sun's largest source trees, including those for Solaris and Java, but as part of the process of converting those code bases to open source communities, they were moved to newer revision control systems such as Mercurial. TeamWare features a number of advanced features not found in earlier version control systems like RCS and CVS. In particular, it features a hierarchy of source repositories, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	BitKeeper BitKeeper is a software tool for distributed revision control of computer source code. Originally developed as proprietary software by BitMover Inc., a privately held company based in Los Gatos, California, it was released as open-source software under the Apache-2.0 license on 9 May 2016. BitKeeper is no longer being developed. History BitKeeper was originally developed by BitMover Inc., a privately held company from Los Gatos, California owned by Larry McVoy, who had previously designed TeamWare. BitKeeper and the Linux Kernel BitKeeper was first mentioned as a solution to some of the growing pains that Linux was having in September 1998. Early access betas were available in May 1999 and on May 4, 2000, the first public release of BitKeeper was made available. BitMover used to provide access to the system for certain open-source or free-software projects, one of which was the source code of the Linux kernel. The license for the "community" version of BitKeeper had allowe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	GNU Bazaar GNU Bazaar (formerly Bazaar-NG, command line tool bzr) is a distributed and client–server revision control system sponsored by Canonical. Bazaar can be used by a single developer working on multiple branches of local content, or by teams collaborating across a network. Bazaar is written in the Python programming language, with packages for major Linux distributions, and Microsoft Windows. Bazaar is free software and part of the GNU Project. Features Bazaar commands are similar to those found in CVS or Subversion. A new project can be started and maintained without a remote repository server by invoking bzr init in a directory which a person wishes to version. In contrast to purely distributed version control systems which do not use a central server, Bazaar supports working with or without a central server. It is possible to use both methods at the same time with the same project. The websites Launchpad and SourceForge provide free hosting service for projects manage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Delta Encoding Delta encoding is a way of storing or transmitting data in the form of '' differences'' (deltas) between sequential data rather than complete files; more generally this is known as data differencing. Delta encoding is sometimes called delta compression, particularly where archival histories of changes are required (e.g., in revision control software). The differences are recorded in discrete files called "deltas" or "diffs". In situations where differences are small – for example, the change of a few words in a large document or the change of a few records in a large table – delta encoding greatly reduces data redundancy. Collections of unique deltas are substantially more space-efficient than their non-encoded equivalents. From a logical point of view the difference between two data values is the information required to obtain one value from the other – see relative entropy. The difference between identical values (under some equivalence) is often called ''0'' or the neut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]