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 NNAAMMEE
      sccsfile − format of SCCS file

 DDEESSCCRRIIPPTTIIOONN
      An SCCS file is an ASCII file consisting of six logical parts:

           checksum       Sum of all characters in the file except the first
                          line.
           delta table    Contains information about each delta.
           user names     Login names and/or numerical group IDs of users
                          who are allowed to add deltas.
           flags          Definitions of internal keywords.  comments
                          Arbitrary descriptive information about the file.
           body           Actual text lines intermixed with control lines.

      Throughout an SCCS file there are lines beginning with the ASCII SOH
      (start of heading) character (octal 001).  This character is hereafter
      referred to as the control character and is represented graphically as
      @.  Any line described below that is not depicted as beginning with
      the control character is prevented from beginning with the control
      character.  All lines in the SCCS file are limited to BUFSIZ (defined
      in <stdio.h>) characters in length.

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

      The following describes each logical part of an SCCS file detail:

           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 in the first line.  The @h sequence provides a
                magic number consisting of the two bytes 0x01 and 0x68.
                (Other versions of UNIX‐like operating systems usually use
                this same value but it may be displayed or documented as a
                single number with a different byte order.)

           Delta table
                The delta table consists of a variable number of entries of
                the form:

                     @s  DDDDD/DDDDD/DDDDD
                     @d <type> <SID>  yr/mo/da hr:mi:se  <pgmr> DDDDD DDDDD
                     @i DDDDD ...
                     @x DDDDD ...
                     @g DDDDD ...
                     @m <MR number>



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                        .
                        .
                        .
                     @c <comments> ...
                        .
                        .
                        .
                     @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 SID (SCCS ID) of the delta, the date
                and time when the delta was created, 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 (modification
                request) 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 are allowed to 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.
                Any line starting with a !  prohibits the specified group or
                user from making deltas.

           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 <keyword string>
                     @f b
                     @f m <module name>
                     @f f <floor>



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                     @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>

                The above flags function as follows:

                     t    Defines the replacement for the %Y% identification
                          keyword.

                     v    Controls prompting for MR numbers in addition to
                          comments.  If the optional text is present, it
                          defines an MR number‐validity checking program.

                     i    Controls the warning/error aspect of the ‘‘No id
                          keywords’’ message.  When the i flag is not
                          present, the message is only a warning; when the i
                          flag is present, this message causes a fatal error
                          (a get on the file fails, or the delta is not
                          made).

                     b    When the b flag is present, the −b keyletter can
                          be used on the get command to cause a branch in
                          the delta tree.

                     m    Defines the first choice for the replacement text
                          of the %M% identification keyword.

                     f    Defines the ‘‘floor’’ release; the release below
                          which no deltas can be added.

                     c    Defines the ‘‘ceiling’’ release; the release above
                          which no deltas can be added.

                     d    Defines the default SID to be used when none is
                          specified on a get command.

                     n    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
                          (such as, 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.

                     j    Causes get to allow concurrent edits of the same
                          base SID.  See admin(1) for restrictions.




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                     l    Defines a list of releases that are locked against
                          editing (get(1) with the −e keyletter).

                     q    Defines the replacement for the %Q% identification
                          keyword.

                     z    Used in certain specialized interface programs.

           Comments
                Arbitrary text is surrounded by the bracketing lines @t and
                @T.  The comments section typically contains a description
                of the file’s purpose.

           Body Consists of text lines and control lines.  Text lines do not
                begin with the control character; control lines do.  There
                are three kinds of control lines:

                     Type      Represented By:

                     insert    @I DDDDD
                     delete    @D DDDDD
                     end       @E DDDDD

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

 WWAARRNNIINNGGSS
      SCCS files can be any length, but the number of lines in the text file
      itself cannot exceed 99999 lines.

 SSEEEE AALLSSOO
      admin(1), delta(1), get(1), prs(1).






















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