Editing Source Code Control System (section)

== SCCS files ==
An SCCS file consists of three parts:<ref name=":0">{{Cite web|url=https://www.ibm.com/support/knowledgecenter/ssw_aix_53/com.ibm.aix.genprogc/doc/genprogc/sccs.htm|title=General Programming Concepts: Writing and Debugging Programs|last=IBM|website=IBM Knowledge Center|date=7 June 2018 }}</ref>   
* Delta table
* Access and tracking flags
* Body of the text

=== Delta table ===
In SCCS, a delta is a single revision in an SCCS file. Deltas are stored in a delta table, so each SCCS file has its own record of changes.<ref name=":0" />

=== Control and tracking flags in SCCS files ===
Every operation of each SCCS file is tracked by flags. Their functions are as below:<ref name=":0" />
* Setting permissions for editing of every SCCS file.
* Control each release of every SCCS file.
* Permitting [[collaborative editing]] of every SCCS file.
* Mutual-referencing changes of every SCCS file.

=== Body ===
SCCS uses three types of control records for keeping track of insertions and deletions applied in different deltas. They are the insertion control record, the deletion control record, and the end control record. Whenever a user changes some part of the text, a control record is inserted surrounding the change. The control records are stored in the body along with the original text records.<ref name = "r1"/>