Editing Source Code Control System (section)

==History==
In 1972, [[Marc Rochkind]] developed SCCS in [[SNOBOL|SNOBOL4]] at [[Bell Labs]] for an [[IBM System/370]] computer running [[OS/360]] [[Multiprogramming with a Variable number of Tasks|MVT]].<ref name = "r1"/> He rewrote SCCS in the C programming language for use under [[UNIX]], then running on a [[PDP-11]], in 1973.

The first publicly released version was SCCS version 4 from February 18, 1977.<ref>http://sccs.sourceforge.net/PWB.html AT&T Announcement for SCCSv4</ref> It was available with the [[PWB/UNIX|Programmer's Workbench]] (PWB) edition of the [[operating system]]. Release 4 of SCCS was the first version that used a text-based history file format, earlier versions did use binary history file formats. Release 4 was no longer written or maintained by Marc Rochkind. Subsequently, SCCS was included in [[AT&T]]'s commercial [[UNIX System III|System III]] and [[UNIX System V|System V]] distributions.  It was not licensed with [[UNIX/32V|32V]], the ancestor to [[Berkeley Software Distribution|BSD]].<ref>SCCS [http://minnie.tuhs.org/cgi-bin/utree.pl?file=4BSD/usr/man/cat1/what.1 what(1)] manpage from 4BSD, 1980, on the website of [http://www.tuhs.org/ The Unix Heritage Society] {{webarchive|url=https://web.archive.org/web/20050831153956/http://www.tuhs.org/ |date=2005-08-31 }}.</ref> The SCCS command set is now part of the [[Single UNIX Specification]].

SCCS was the dominant version control system for Unix until later [[version control]] systems, notably the [[Revision Control System|RCS]] and later [[Concurrent Versions System|CVS]], gained more widespread adoption.  Today, these early version control systems are generally considered obsolete, particularly in the [[open-source software|open-source]] community, which has largely embraced [[distributed version control]] systems.  However, the SCCS file format is still used internally by a few newer version control programs, including ''[[BitKeeper]]'' and ''[[TeamWare]]''. The latter is a frontend to SCCS. Sablime<ref name="sablime">{{cite web|title=Sablime Webpage|website=Alcatel-Lucent|url=http://sablime.alcatel-lucent.com|archive-url=https://web.archive.org/web/20160722092853/http://sablime.alcatel-lucent.com/|archive-date=2016-07-22|url-status=dead }}</ref> has been developed from a modified version of SCCS<ref>Estublier, Jacky, David Leblang, [[André van der Hoek]], Reidar Conradi, Geoffrey Clemm, Walter Tichy, and Darcy Wiborg-Weber. “Impact of software engineering research on the practice of software configuration management.” ACM Transactions on Software Engineering and Methodology (TOSEM) 14 (October 2005): 383–430.</ref> but uses a history file format that is incompatible with SCCS.  The SCCS file format uses a storage technique called [[interleaved deltas]] (or the weave<ref>{{Citation |last=Hudson |first=Greg |url=http://web.mit.edu/ghudson/thoughts/file-versioning |title=Notes on keeping version histories of files |publisher=Unpublished personal notes |date=2002-10-03}}</ref>).  This storage technique is now considered by many [[version control]] system developers as foundational to advanced [[Merge (version control)|merging]] and versioning techniques,<ref>Estublier, Jacky, David Leblang, [[André van der Hoek]], Reidar Conradi, Geoffrey Clemm, Walter Tichy, and Darcy Wiborg-Weber. “Impact of software engineering research on the practice of software configuration management.” ACM Transactions on Software Engineering and Methodology (TOSEM) 14 (October 2005): p.398.</ref> such as the "Precise Codeville" ("pcdv") merge.

Apart from correcting [[Year 2000 problem]]s in 1999, no active development has taken place on the various UNIX vendor-specific SCCS versions.<ref>
[https://www.gnu.org/software/cssc/ What is SCCS], GNU operating System</ref>
In 2006, [[Sun Microsystems]] (today part of [[Oracle Corporation|Oracle]]) released their [[Solaris (operating system)|Solaris]] version of SCCS as [[open-source software|open-source]] under the [[Common Development and Distribution License|CDDL license]] as part of their efforts to open-source Solaris.<ref>{{cite web|url=http://mail.opensolaris.org/pipermail/opensolaris-announce/2006-December/000364.html |title=SCCS/make source available |date=2006-12-19 |access-date=2011-11-14 |author=Stephen Lau, [[Sun Microsystems]] |url-status=dead |archive-url=https://web.archive.org/web/20120425142501/http://mail.opensolaris.org/pipermail/opensolaris-announce/2006-December/000364.html |archive-date=April 25, 2012 }}</ref>