NAME

sccs - front end for the SCCS subsystem (DEVELOPMENT)

SYNOPSIS

[XSI] sccs [-r] [-d path] [-p path] command [options...] [operands...]

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.

OPTIONS

The sccs utility shall conform to XBD 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.

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.

STDIN

See the utility description for the specified command.

INPUT FILES

See the utility description for the specified command.

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 XBD 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.

ASYNCHRONOUS EVENTS

Default.

STDOUT

See the utility description for the specified command.

STDERR

See the utility description for the specified command.

OUTPUT FILES

See the utility description for the specified command.

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.

EXIT STATUS

The following exit values shall be returned:

 0

Successful completion.

>0

An error occurred.

CONSEQUENCES OF ERRORS

Default.

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.

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) $@
   
   

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.

FUTURE DIRECTIONS

None.

SEE ALSO

admin, delta, get, make, prs, rmdel, sact, unget, val, what

XBD Environment Variables, Utility Syntax Guidelines

CHANGE HISTORY

First released in Issue 4.

Issue 6

In the ENVIRONMENT VARIABLES section, the PROJECTDIR description is updated from "otherwise, the home directory of a user of that name is examined" to "otherwise, the value of PROJECTDIR is treated as a user name and that user's initial working directory is examined".

The normative text is reworded to avoid use of the term "must" for application requirements.

Issue 7

SD5-XCU-ERN-97 is applied, updating the SYNOPSIS.