интерфейс для подсистемы SCCS (РАЗРАБОТКА) (front end for the SCCS subsystem (DEVELOPMENT))
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
sccs — front end for the SCCS subsystem (DEVELOPMENT)
Синопсис (Synopsis)
sccs [-r] [-d path] [-p path] command [options...] [operands...]
Описание (Description)
The sccs utility is a front end to the SCCS programs. It also
includes the capability to run set-user-id to another user to
provide additional protection.
The sccs utility shall invoke the specified command with the
specified options and operands. By default, each of the operands
shall be modified by prefixing it with the string "SCCS/s.".
The command can be the name of one of the SCCS utilities in this
volume of POSIX.1‐2017 (admin, delta, get, prs, rmdel, sact,
unget, val, or what) or one of the pseudo-utilities listed in the
EXTENDED DESCRIPTION section.
Параметры (Options)
The sccs utility shall conform to the Base Definitions volume of
POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines, except
that options operands are actually options to be passed to the
utility named by command. When the portion of the command:
command [options ... ] [operands ... ]
is considered, all of the pseudo-utilities used as command shall
support the Utility Syntax Guidelines. Any of the other SCCS
utilities that can be invoked in this manner support the
Guidelines to the extent indicated by their individual OPTIONS
sections.
The following options shall be supported preceding the command
operand:
-d path A pathname of a directory to be used as a root
directory for the SCCS files. The default shall be the
current directory. The -d option shall take precedence
over the PROJECTDIR variable. See -p.
-p path A pathname of a directory in which the SCCS files are
located. The default shall be the SCCS directory.
The -p option differs from the -d option in that the -d
option-argument shall be prefixed to the entire
pathname and the -p option-argument shall be inserted
before the final component of the pathname. For
example:
sccs -d /x -p y get a/b
converts to:
get /x/a/y/s.b
This allows the creation of aliases such as:
alias syssccs="sccs -d /usr/src"
which is used as:
syssccs get cmd/who.c
-r Invoke command with the real user ID of the process,
not any effective user ID that the sccs utility is set
to. Certain commands (admin, check, clean, diffs, info,
rmdel, and tell) cannot be run set-user-ID by all
users, since this would allow anyone to change the
authorizations. These commands are always run as the
real user.
Операнды (Operands)
The following operands shall be supported:
command An SCCS utility name or the name of one of the pseudo-
utilities listed in the EXTENDED DESCRIPTION section.
options An option or option-argument to be passed to command.
operands An operand to be passed to command.
Стандартный ввод (Stdin)
See the utility description for the specified command.
Входные файлы (Input files)
See the utility description for the specified command.
Переменные окружения (Environment variables)
The following environment variables shall affect the execution of
sccs:
LANG Provide a default value for the internationalization
variables that are unset or null. (See the Base
Definitions volume of POSIX.1‐2017, Section 8.2,
Internationalization Variables for the precedence of
internationalization variables used to determine the
values of locale categories.)
LC_ALL If set to a non-empty string value, override the values
of all the other internationalization variables.
LC_CTYPE Determine the locale for the interpretation of
sequences of bytes of text data as characters (for
example, single-byte as opposed to multi-byte
characters in arguments and input files).
LC_MESSAGES
Determine the locale that should be used to affect the
format and contents of diagnostic messages written to
standard error.
NLSPATH Determine the location of message catalogs for the
processing of LC_MESSAGES.
PROJECTDIR
Provide a default value for the -d path option. If the
value of PROJECTDIR begins with a <slash>, it shall be
considered an absolute pathname; otherwise, the value
of PROJECTDIR is treated as a user name and that user's
initial working directory shall be examined for a
subdirectory src or source. If such a directory is
found, it shall be used. Otherwise, the value shall be
used as a relative pathname.
Additional environment variable effects may be found in the
utility description for the specified command.
Асинхронные события (Asynchronous events)
Default.
Стандартный вывод (Stdout)
See the utility description for the specified command.
Стандартный вывод сообщений (Stderr)
See the utility description for the specified command.
Выходные файлы (Output files)
See the utility description for the specified command.
Расширенное описание (Extended description)
The following pseudo-utilities shall be supported as command
operands. All options referred to in the following list are
values given in the options operands following command.
check Equivalent to info, except that nothing shall be printed
if nothing is being edited, and a non-zero exit status
shall be returned if anything is being edited. The intent
is to have this included in an ``install'' entry in a
makefile to ensure that everything is included into the
SCCS file before a version is installed.
clean Remove everything from the current directory that can be
recreated from SCCS files, but do not remove any files
being edited. If the -b option is given, branches shall
be ignored in the determination of whether they are being
edited; this is dangerous if branches are kept in the
same directory.
create Create an SCCS file, taking the initial contents from the
file of the same name. Any options to admin are accepted.
If the creation is successful, the original files shall
be renamed by prefixing the basenames with a comma. These
renamed files should be removed after it has been
verified that the SCCS files have been created
successfully.
delget Perform a delta on the named files and then get new
versions. The new versions shall have ID keywords
expanded and shall not be editable. Any -m, -p, -r, -s,
and -y options shall be passed to delta, and any -b, -c,
-e, -i, -k, -l, -s, and -x options shall be passed to
get.
deledit Equivalent to delget, except that the get phase shall
include the -e option. This option is useful for making a
checkpoint of the current editing phase. The same options
shall be passed to delta as described above, and all the
options listed for get above except -e shall be passed to
edit.
diffs Write a difference listing between the current version of
the files checked out for editing and the versions in
SCCS format. Any -r, -c, -i, -x, and -t options shall be
passed to get; any -l, -s, -e, -f, -h, and -b options
shall be passed to diff. A -C option shall be passed to
diff as -c.
edit Equivalent to get -e.
fix Remove the named delta, but leave a copy of the delta
with the changes that were in it. It is useful for fixing
small compiler bugs, and so on. The application shall
ensure that it is followed by a -r SID option. Since fix
does not leave audit trails, it should be used carefully.
info Write a listing of all files being edited. If the -b
option is given, branches (that is, SIDs with two or
fewer components) shall be ignored. If a -u user option
is given, then only files being edited by the named user
shall be listed. A -U option shall be equivalent to
-u<current user>.
print Write out verbose information about the named files,
equivalent to sccs prs.
tell Write a <newline>-separated list of the files being
edited to standard output. Takes the -b, -u, and -U
options like info and check.
unedit This is the opposite of an edit or a get -e. It should
be used with caution, since any changes made since the
get are lost.
Статус выхода (Exit)
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
Последствия ошибок (Consequences of errors)
Default.
The following sections are informative.
Использование в приложениях (Application usage)
Many of the SCCS utilities take directory names as operands as
well as specific filenames. The pseudo-utilities supported by
sccs are not described as having this capability, but are not
prohibited from doing so.
Примеры (Examples)
1. To get a file for editing, edit it and produce a new delta:
sccs get -e file.c
ex file.c
sccs delta file.c
2. To get a file from another directory:
sccs -p /usr/src/sccs/s. get cc.c
or:
sccs get /usr/src/sccs/s.cc.c
3. To make a delta of a large number of files in the current
directory:
sccs delta *.c
4. To get a list of files being edited that are not on branches:
sccs info -b
5. To delta everything being edited by the current user:
sccs delta $(sccs tell -U)
6. In a makefile, to get source files from an SCCS file if it
does not already exist:
SRCS = <list of source files>
$(SRCS):
sccs get $(REL) $@
Обоснование (Rationale)
sccs and its associated utilities are part of the XSI Development
Utilities option within the XSI option.
SCCS is an abbreviation for Source Code Control System. It is a
maintenance and enhancement tracking tool. When a file is put
under SCCS, the source code control system maintains the file
and, when changes are made, identifies and stores them in the
file with the original source code and/or documentation. As other
changes are made, they too are identified and retained in the
file.
Retrieval of the original and any set of changes is possible. Any
version of the file as it develops can be reconstructed for
inspection or additional modification. History data can be stored
with each version, documenting why the changes were made, who
made them, and when they were made.
Будущие направления (Future directions)
None.
Смотри также (See also)
admin(1p), delta(1p), get(1p), make(1p), prs(1p), rmdel(1p),
sact(1p), unget(1p), val(1p), what(1p)
The Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables, Section 12.2, Utility Syntax Guidelines
