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:''For the company, see PV Crystalox Solar'' 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). However PVCS can also be configured to support several users simultaneously attempting to edit the file; in this case the second chronological committer will have a branch created for him/her so that both modifications, instead of conflicting, will appear as parallel histories for the same file. This is unlike Concurrent Versions System (CVS) and Subversion where the second committer needs to first ''merge'' the changes via the ''update'' command and then resolve conflicts (when they exist) before actually committing. Originally developed by Don Kinzer and published by Polytron in 1985, through a history of acquisitions and mergers, the product was at times owned by Sage Software of Rockville, Maryland (unrelated to Sage Software of the UK), Intersolv, and Merant Software. The latter was acquired by Serena Software in 2004, which was then acquired by Silver Lake Partners in 2006. Synergex ported both the PVCS Version Manager and the PVCS Configuration Builder (an extended make utility, including a variant of the command line tool make〔(mailing list discussion about porting PVCS-make scripts to GNU-make )〕) to various Unix platforms and OpenVMS. In 2009, Serena Software clarified that it will continue to invest in PVCS and provide support to PVCS customers for the foreseeable future. PVCS Version Manager 8.5 release (2014) introduces both new feature and new platform support. ==See also== *List of version control software 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PVCS」の詳細全文を読む スポンサード リンク
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