


      SCCSFILE(4)                 (UNIX 5.0)                SCCSFILE(4)



      NAME
           sccsfile - format of SCCS file

      DESCRIPTION
           An SCCS file is an ASCII file.  It consists of six logical
           parts:  the checksum, the delta table  (contains information
           about each delta), user names  (contains login names and/or
           numerical group IDs of users who may add deltas), flags
           (contains definitions of internal keywords), comments
           (contains arbitrary descriptive information about the file),
           and the body (contains the actual text lines intermixed with
           control lines).

           Throughout an SCCS file there are lines which begin with the
           ASCII SOH (start of heading) character (octal 001).  This
           character is hereafter referred to as the control character
           and will be represented graphically as @.  Any line
           described below which is not depicted as beginning with the
           control character is prevented from beginning with the
           control character.

           Entries of the form DDDDD represent a five digit string (a
           number between 00000 and 99999).

           Each logical part of an SCCS file is described in detail
           below.

           Checksum
                The checksum is the first line of an SCCS file.  The
                form of the line is:

                     @hDDDDD

                The value of the checksum is the sum of all characters,
                except those of the first line.  The @h provides a
                magic number  of (octal) 064001.

           Delta table
                The delta table consists of a variable number of
                entries of the form:
                     @s DDDDD/DDDDD/DDDDD
                     @d <type> <SCCS ID> yr/mo/da hr:mi:se <pgmr> DDDDD DDDDD
                     @i DDDDD ...
                     @x DDDDD ...
                     @g DDDDD ...
                     @m <MR number>
                       .
                       .
                       .
                     @c <comments> ...
                       .
                       .



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      SCCSFILE(4)                 (UNIX 5.0)                SCCSFILE(4)



                       .
                     @e

                The first line (@s) contains the number of lines
                inserted/deleted/unchanged respectively.  The second
                line (@d) contains the type of the delta (currently,
                normal: D, and removed: R), the SCCS ID of the delta,
                the date and time of creation of the delta, the login
                name corresponding to the real user ID at the time the
                delta was created, and the serial numbers of the delta
                and its predecessor, respectively.

                The @i, @x, and @g lines contain the serial numbers of
                deltas included, excluded, and ignored, respectively.
                These lines are optional.

                The @m lines (optional) each contain one MR number
                associated with the delta; the @c lines contain
                comments associated with the delta.

                The @e line ends the delta table entry.

           User names
                The list of login names and/or numerical group IDs of
                users who may add deltas to the file, separated by
                new-lines.  The lines containing these login names
                and/or numerical group IDs are surrounded by the
                bracketing lines @u and @U.  An empty list allows
                anyone to make a delta.

           Flags
                Keywords used internally (see admin(1) for more
                information on their use).  Each flag line takes the
                form:

                     @f <flag> <optional text>

                The following flags are defined:
                     @f t <type of program>
                     @f v <program name>
                     @f i
                     @f b
                     @f m <module name>
                     @f f <floor>
                     @f c <ceiling>
                     @f d <default-sid>
                     @f n
                     @f j
                     @f l <lock-releases>
                     @f q <user defined>
                     @f z <reserved for use in interfaces>




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      SCCSFILE(4)                 (UNIX 5.0)                SCCSFILE(4)



                The t flag defines the replacement for the %Y%
                identification keyword.  The v flag controls prompting
                for MR numbers in addition to comments; if the optional
                text is present it defines an MR number validity
                checking program.  The i flag controls the
                warning/error aspect of the ``No id keywords'' message.
                When the i flag is not present, this message is only a
                warning; when the i flag is present, this message will
                cause a ``fatal'' error (the file will not be gotten,
                or the delta will not be made).  When the b flag is
                present the -b keyletter may be used on the get command
                to cause a branch in the delta tree.  The m flag
                defines the first choice for the replacement text of
                the %M% identification keyword.  The f flag defines the
                ``floor'' release; the release below which no deltas
                may be added.  The c flag defines the ``ceiling''
                release; the release above which no deltas may be
                added.  The d flag defines the default SID to be used
                when none is specified on a get command.  The n flag
                causes delta to insert a ``null'' delta (a delta that
                applies no changes) in those releases that are skipped
                when a delta is made in a new release (e.g., when delta
                5.1 is made after delta 2.7, releases 3 and 4 are
                skipped).  The absence of the n flag causes skipped
                releases to be completely empty.  The j flag causes get
                to allow concurrent edits of the same base SID.  The l
                flag defines a list of releases that are locked against
                editing (get(1) with the -e keyletter).  The q flag
                defines the replacement for the %Q% identification
                keyword.  z flag is used in certain specialized
                interface programs.

           Comments
                Arbitrary text surrounded by the bracketing lines @t
                and @T.  The comments section typically will contain a
                description of the file's purpose.

           Body
                The body consists of text lines and control lines.
                Text lines don't begin with the control character,
                control lines do.  There are three kinds of control
                lines:  insert, delete, and end, represented by:

                     @I DDDDD
                     @D DDDDD
                     @E DDDDD

                respectively.  The digit string is the serial number
                corresponding to the delta for the control line.

      SEE ALSO
           admin(1), delta(1), get(1), prs(1).



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      SCCSFILE(4)                 (UNIX 5.0)                SCCSFILE(4)



           Source Code Control System User's Guide in the ROS Utility
           Guide





















































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