проверить файлы SCCS (РАЗРАБОТКА) (validate SCCS files (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)
val — validate SCCS files (DEVELOPMENT)
Синопсис (Synopsis)
val -
val [-s] [-m name] [-r SID] [-y type] file...
Описание (Description)
The val utility shall determine whether the specified file is an
SCCS file meeting the characteristics specified by the options.
Параметры (Options)
The val utility shall conform to the Base Definitions volume of
POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines, except
that the usage of the '-' operand is not strictly as intended by
the guidelines (that is, reading options and operands from
standard input).
The following options shall be supported:
-m name Specify a name, which is compared with the SCCS %M%
keyword in file; see get(1p).
-r SID Specify a SID (SCCS Identification String), an SCCS
delta number. A check shall be made to determine
whether the SID is ambiguous (for example, -r 1 is
ambiguous because it physically does not exist but
implies 1.1, 1.2, and so on, which may exist) or
invalid (for example, -r 1.0 or -r 1.1.0 are invalid
because neither case can exist as a valid delta
number). If the SID is valid and not ambiguous, a
check shall be made to determine whether it actually
exists.
-s Silence the diagnostic message normally written to
standard output for any error that is detected while
processing each named file on a given command line.
-y type Specify a type, which shall be compared with the SCCS
%Y% keyword in file; see get(1p).
Операнды (Operands)
The following operands shall be supported:
file A pathname of an existing SCCS file. If exactly one
file operand appears, and it is '-', the standard input
shall be read: each line shall be independently
processed as if it were a command line argument list.
(However, the line is not subjected to any of the shell
word expansions, such as parameter expansion or quote
removal.)
Стандартный ввод (Stdin)
The standard input shall be a text file used only when the file
operand is specified as '-'.
Входные файлы (Input files)
Any SCCS files processed shall be files of an unspecified format.
Переменные окружения (Environment variables)
The following environment variables shall affect the execution of
val:
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, and informative messages written to
standard output.
NLSPATH Determine the location of message catalogs for the
processing of LC_MESSAGES.
Асинхронные события (Asynchronous events)
Default.
Стандартный вывод (Stdout)
The standard output shall consist of informative messages about
either:
1. Each file processed
2. Each command line read from standard input
If the standard input is not used, for each file operand yielding
a discrepancy, the output line shall have the following format:
"%s: %s\n", <pathname>, <unspecified string>
If the standard input is used, for each input line yielding a
discrepancy, the output shall have the following format:
"%s\n\n %s: %s\n", <input>, <pathname>, <unspecified string>
where <input> is the input line minus its terminating <newline>.
Стандартный вывод сообщений (Stderr)
Not used.
Выходные файлы (Output files)
None.
Расширенное описание (Extended description)
None.
Статус выхода (Exit)
The 8-bit code returned by val shall be a disjunction of the
possible errors; that is, it can be interpreted as a bit string
where set bits are interpreted as follows:
0x80 = Missing file argument.
0x40 = Unknown or duplicate option.
0x20 = Corrupted SCCS file.
0x10 = Cannot open file or file not SCCS.
0x08 = SID is invalid or ambiguous.
0x04 = SID does not exist.
0x02 = %Y%, -y mismatch.
0x01 = %M%, -m mismatch.
Note that val can process two or more files on a given command
line and can process multiple command lines (when reading the
standard input). In these cases an aggregate code shall be
returned: a logical OR of the codes generated for each command
line and file processed.
Последствия ошибок (Consequences of errors)
Default.
The following sections are informative.
Использование в приложениях (Application usage)
Since the val exit status sets the 0x80 bit, shell applications
checking "$?" cannot tell if it terminated due to a missing file
argument or receipt of a signal.
Примеры (Examples)
In a directory with three SCCS files—s.x (of t type ``text''),
s.y, and s.z (a corrupted file)—the following command could
produce the output shown:
val - <<EOF
-y source s.x
-m y s.y
s.z
EOF
-y source s.x
s.x: %Y%, -y mismatch
s.z
s.z: corrupted SCCS file
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
admin(1p), delta(1p), get(1p), prs(1p)
The Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables, Section 12.2, Utility Syntax Guidelines
