вернуть истинное значение (return true value)
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)
true — return true value
Описание (Description)
The true utility shall return with exit code zero.
Параметры (Options)
None.
Операнды (Operands)
None.
Стандартный ввод (Stdin)
Not used.
Входные файлы (Input files)
None.
Переменные окружения (Environment variables)
None.
Асинхронные события (Asynchronous events)
Default.
Стандартный вывод (Stdout)
Not used.
Стандартный вывод сообщений (Stderr)
Not used.
Выходные файлы (Output files)
None.
Расширенное описание (Extended description)
None.
Статус выхода (Exit)
Zero.
Последствия ошибок (Consequences of errors)
None.
The following sections are informative.
Использование в приложениях (Application usage)
This utility is typically used in shell scripts, as shown in the
EXAMPLES section. The special built-in utility : is sometimes
more efficient than true.
Примеры (Examples)
This command is executed forever:
while true
do
command
done
Обоснование (Rationale)
The true utility has been retained in this volume of
POSIX.1‐2017, even though the shell special built-in : provides
similar functionality, because true is widely used in historical
scripts and is less cryptic to novice script readers.
Будущие направления (Future directions)
None.
Смотри также (See also)
Section 2.9, Shell Commands, false(1p)
