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
colon — null utility
СИНТАКСИС
: [argument...]
ОПИСАНИЕ
This utility shall only expand command arguments. It is used
when a command is needed, as in the then condition of an if
command, but nothing is to be done by the command.
ПАРАМЕТРЫ
None.
ОПЕРАНДЫ
See the DESCRIPTION.
СТАНДАРТНЫЙ ВВОД
Not used.
ФАЙЛЫ ВВОДА
None.
ПЕРЕМЕННЫЕ ОКРУЖЕНИЯ
None.
АСИНХРОННЫЕ СОБЫТИЯ
Default.
СТАНДАРТНЫЙ ВЫВОД
Not used.
СТАНДАРТНАЯ ОШИБКА
The standard error shall be used only for diagnostic messages.
ФАЙЛЫ ВЫВОДА
None.
ПОДРОБНОЕ ОПИСАНИЕ
None.
КОД ВЫХОДА
Zero.
ПОСЛЕДСТВИЯ ОШИБОК
Default.
The following sections are informative.
ПРИМЕНЕНИЕ
None.
ПРИМЕРЫ
: ${X=abc}
if false
then :
else echo $X
fi
abc
As with any of the special built-ins, the null utility can also
have variable assignments and redirections associated with it,
such as:
x=y : > z
which sets variable x to the value y (so that it persists after
the null utility completes) and creates or truncates file z.
ОБЪЯСНЕНИЕ
None.
НАПРАВЛЕНИЯ РАЗВИТИЯ
None.
СМОТРИТЕ ТАКЖЕ
Section 2.14, Special Built-In Utilities
АВТОРСКИЕ ПРАВА
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any
discrepancy between this version and the original IEEE and The
Open Group Standard, the original IEEE and The Open Group
Standard is the referee document. The original Standard can be
obtained online at http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 COLON(1P)
