sccsfile(4)							   File Formats 						       sccsfile(4)

NAME

       sccsfile - format of an SCCS history file

DESCRIPTION

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

       checksum        Character count used for error detection.

       delta table     Log containing version info and statistics about each delta.

       usernames       Login names and/or group IDs of users who may add deltas.

       flags	       Definitions of internal keywords.

       comments        Arbitrary descriptive information about the file.

       body	       the Actual text lines intermixed with control lines.

       Each section is described in detail below.

   Conventions
       Throughout  an  SCCS  file there are lines which begin with the ASCII SOH (start of heading) character (octal 001). This character is here-
       after 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).

   Checksum
       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 ...
       ...
       ^Ae

       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 associated with the delta. The ^Ac lines contain comments associated 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 characters. The lines con-
       taining these login names and/or numerical group IDs are surrounded by the bracketing lines ^Au and ^AU. An empty  list	allows	anyone	to
       make a delta.

   Flags
       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 command. 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 tree.

       ^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.

   Comments
       Arbitrary text surrounded by the bracketing lines ^At and ^AT. The comments section typically will contain a description of the file's pur-
       pose.

   Body
       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.

SEE ALSO

       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)

SunOS 5.10							    30 Sep 2002 						       sccsfile(4)