вернуть логин пользователя (return the user's login name)
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)
logname — return the user's login name
Синопсис (Synopsis)
logname
Описание (Description)
The logname utility shall write the user's login name to standard
output. The login name shall be the string that would be returned
by the getlogin() function defined in the System Interfaces
volume of POSIX.1‐2017. Under the conditions where the getlogin()
function would fail, the logname utility shall write a diagnostic
message to standard error and exit with a non-zero exit status.
Параметры (Options)
None.
Операнды (Operands)
None.
Стандартный ввод (Stdin)
Not used.
Входные файлы (Input files)
None.
Переменные окружения (Environment variables)
The following environment variables shall affect the execution of
logname:
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).
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 logname utility output shall be a single line consisting of
the user's login name:
"%s\n", <login name>
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 Successful completion.
>0 An error occurred.
Последствия ошибок (Consequences of errors)
Default.
The following sections are informative.
Использование в приложениях (Application usage)
The logname utility explicitly ignores the LOGNAME environment
variable because environment changes could produce erroneous
results.
Примеры (Examples)
None.
Обоснование (Rationale)
The passwd file is not listed as required because the
implementation may have other means of mapping login names.
Будущие направления (Future directions)
None.
Смотри также (See also)
id(1p), who(1p)
The Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables
The System Interfaces volume of POSIX.1‐2017, getlogin(3p)
