sccsfile - format of an SCCS history file


     An SCCS file is an ASCII  file  consisting  of  six  logical

           Character count used for error detection.

     delta table
           Log containing version info and statistics about  each

           Login names and/or group IDs of users who may add del-

     flags Definitions of internal keywords.

           Arbitrary descriptive information about the file.

     body  the Actual text lines intermixed with control lines.

     Each section is described in detail below.

     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 as `^A'. If a line described below
     is not depicted as beginning with the control character,  it
     cannot do so and still be within SCCS file format.

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

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

     ^A hddddd

     The value of the checksum is  the  sum  of  all  characters,
     except those contained in the first line. The ^Ah provides a
     magic number of (octal) 064001.

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

     ^As inserted/deleted/unchanged
     ^Ad type  sid  yr/mo/da hr:mi:se  username  serial-number  predecessor-sn
     ^Ai include-list
     ^Ax exclude-list
     ^Ag ignored-list
     ^Am mr-number
     ^Ac comments ...

     The  first  line  (^As)  contains  the   number   of   lines
     inserted/deleted/unchanged  respectively.  The  second  line
     (^Ad) contains the type of the delta (normal: D and removed:
     R),  the SCCS ID of the delta, the date and time of creation
     of the delta, the user-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  ^Ai,
     ^Ax,  and  ^Ag  lines  contain  the serial numbers of deltas
     included, excluded, and ignored, respectively.  These  lines
     do not always appear.

     The ^Am lines (optional) each contain one MR number  associ-
     ated  with the delta. The ^Ac lines contain comments associ-
     ated with the delta.

     The ^Ae line ends the delta table entry.

  User Names
     The list of user-names and/or numerical group IDs  of  users
     who may add deltas to the file, separated by NEWLINE charac-
     ters. The lines containing these login names and/or  numeri-
     cal group IDs are surrounded by the bracketing lines ^Au and
     ^AU. An empty list allows anyone to make a delta.

     Flags are keywords  that  are  used  internally  (see  sccs-
     admin(1) for more information on their use).  Each flag line
     takes the form:

      ^Af flag
               optional text

     The following flags are defined in order of appearance:

          ^Af t type-of-program
                Defines the replacement for the %T% ID keyword.

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

          ^Af i Indicates that the `No id keywords' message is to
                generate  an  error that terminates the SCCS com-
                mand. Otherwise, the  message  is  treated  as  a
                warning only.

          ^Af b Indicates that the -b option may be used with the
                SCCS  get command to create a branch in the delta

          ^Af m module-name
                Defines the first choice for the replacement text
                of the %M% ID keyword.

          ^Af f floor
                Defines the "floor" release, that is, the release
                below which no deltas may be added.

          ^Af c ceiling
                Defines  the  "ceiling"  release,  that  is,  the
                release above which no deltas may be added.

          ^Af d default-sid
                The d flag defines the default  SID  to  be  used
                when none is specified on an SCCS get command.

          ^Af n The n flag enables  the  SCCS  delta  command  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 (for example,
                when delta 5.1 is made after delta 2.7,  releases
                3 and 4 are skipped).

          ^Af j Enables the SCCS get command to allow  concurrent
                edits of the same base SID.

          ^Af l lock-releases
                Defines  a  list  of  releases  that  are  locked
                against editing.

          ^Af q user-defined
                Defines the replacement for the %Q% ID keyword.

          ^Af e 0|1
                The e flag indicates whether  a  source  file  is
                encoded  or  not.  A 1 indicates that the file is
                encoded. Source files need  to  be  encoded  when
                they  contain control characters, or when they do
                not end with a NEWLINE. The e flag  allows  files
                that contain binary data to be checked in.

     Arbitrary text surrounded by the bracketing  lines  ^At  and
     ^AT.  The comments section typically will contain a descrip-
     tion of the file's purpose.

     The 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: insert,  delete,
     and end, represented by:

     ^AI ddddd
     ^AD ddddd
     ^AE ddddd

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


     sccs-admin(1),  sccs-cdc(1),  sccs-comb(1),   sccs-delta(1),
     sccs-get(1),  sccs-help(1),  sccs-prs(1), sccs-prt(1), sccs-
     rmdel(1),  sccs-sact(1),  sccs-sccsdiff(1),   sccs-unget(1),
     sccs-val(1), sccs(1), what(1)

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