идентифицировать файлы SCCS (РАЗРАБОТКА) (identify 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)
what — identify SCCS files (DEVELOPMENT)
Синопсис (Synopsis)
what [-s] file...
Описание (Description)
The what utility shall search the given files for all occurrences
of the pattern that get (see get(1p)) substitutes for the %Z%
keyword ("@(#)") and shall write to standard output what follows
until the first occurrence of one of the following:
" > newline \ NUL
Параметры (Options)
The what utility shall conform to the Base Definitions volume of
POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines.
The following option shall be supported:
-s Quit after finding the first occurrence of the pattern
in each file.
Операнды (Operands)
The following operands shall be supported:
file A pathname of a file to search.
Стандартный ввод (Stdin)
Not used.
Входные файлы (Input files)
The input files shall be of any file type.
Переменные окружения (Environment variables)
The following environment variables shall affect the execution of
what:
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.
Асинхронные события (Asynchronous events)
Default.
Стандартный вывод (Stdout)
The standard output shall consist of the following for each file
operand:
"%s:\n\t%s\n", <pathname>, <identification string>
Стандартный вывод сообщений (Stderr)
The standard error shall be used only for diagnostic messages.
Выходные файлы (Output files)
None.
Расширенное описание (Extended description)
None.
Статус выхода (Exit)
The following exit values shall be returned:
0 Any matches were found.
1 Otherwise.
Последствия ошибок (Consequences of errors)
Default.
The following sections are informative.
Использование в приложениях (Application usage)
The what utility is intended to be used in conjunction with the
SCCS command get, which automatically inserts identifying
information, but it can also be used where the information is
inserted by any other means.
When the string "@(#)" is included in a library routine in a
shared library, it might not be found in an a.out file using that
library routine.
Примеры (Examples)
If the C-language program in file f.c contains:
char ident[] = "@(#)identification information";
and f.c is compiled to yield f.o and a.out, then the command:
what f.c f.o a.out
writes:
f.c:
identification information
...
f.o:
identification information
...
a.out:
identification information
...
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
get(1p)
The Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables, Section 12.2, Utility Syntax Guidelines
