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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  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 be-
       tween 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  (oc-
       tal) 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/un-
       changed 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 ig-
       nored, 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 contain-
       ing  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 17:21:50 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
		    sccsfile.4 ID keyword.

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

	      ^Af c ceiling
		    Defines  the "ceiling" release; 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	 edit-
		    ing.

	      ^Af q user defined
		    Defines the	replacement for	the  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 charac-
		    ters, 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 com-
       ments 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 5.9			  5 Oct	1990			   sccsfile(4)

NAME | DESCRIPTION | SEE ALSO

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