sccsfile - format of an SCCS history file
An SCCS file is an ASCII file consisting of six logical
Character count used for error detection.
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:
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.
The delta table consists of a variable number of entries of
^Ad type sid yr/mo/da hr:mi:se username serial-number predecessor-sn
^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.
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:
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
^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
^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:
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)
Man(1) output converted with