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introduction to sccs
attention: using non-sccs commands to edit sccs files can damage the sccs files.use sccs commands on an sccs file. if you wish to look at the structure of an sccs file, use the pg command or a similar command to view its contents. however, do not use an editor to directly change the file. 【程序编程相关:prevent undeliberate】
the sccs commands form a complete system for creating, editing, converting, or changing the controls on sccs files. an sccs file is any text file controlled with sccs commands. all sccs files have the prefix s., which sets them apart from regular text files. 【推荐阅读:ulimit使用简介】
an sccs file is made up of three parts: 【扩展信息:stty技巧小全】
to change text in an sccs file, use an sccs command (such as the get command) to obtain a version of the file for editing, and then use any editor to modify the text. after changing the file, use the delta command to save the changes. to store the separate versions of a file, and control access to its contents, sccs files have a unique structure.
delta table access and tracking flags body of the textdelta table in sccs files
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