выполнять команды в текущей среде (execute commands in the current environment)
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)
dot — execute commands in the current environment
Синопсис (Synopsis)
. file
Описание (Description)
The shell shall execute commands from the file in the current
environment.
If file does not contain a <slash>, the shell shall use the
search path specified by PATH to find the directory containing
file. Unlike normal command search, however, the file searched
for by the dot utility need not be executable. If no readable
file is found, a non-interactive shell shall abort; an
interactive shell shall write a diagnostic message to standard
error, but this condition shall not be considered a syntax error.
Параметры (Options)
None.
Операнды (Operands)
See the DESCRIPTION.
Стандартный ввод (Stdin)
Not used.
Входные файлы (Input files)
See the DESCRIPTION.
Переменные окружения (Environment variables)
See the DESCRIPTION.
Асинхронные события (Asynchronous events)
Default.
Стандартный вывод (Stdout)
Not used.
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)
If no readable file was found or if the commands in the file
could not be parsed, and the shell is interactive (and therefore
does not abort; see Section 2.8.1, Consequences of Shell Errors),
the exit status shall be non-zero. Otherwise, return the value of
the last command executed, or a zero exit status if no command is
executed.
Последствия ошибок (Consequences of errors)
Default.
The following sections are informative.
Использование в приложениях (Application usage)
None.
Примеры (Examples)
cat foobar
foo=hello bar=world
. ./foobar
echo $foo $bar
hello world
Обоснование (Rationale)
Some older implementations searched the current directory for the
file, even if the value of PATH disallowed it. This behavior was
omitted from this volume of POSIX.1‐2017 due to concerns about
introducing the susceptibility to trojan horses that the user
might be trying to avoid by leaving dot out of PATH.
The KornShell version of dot takes optional arguments that are
set to the positional parameters. This is a valid extension that
allows a dot script to behave identically to a function.
Будущие направления (Future directions)
None.
Смотри также (See also)
Section 2.14, Special Built-In Utilities, return(1p)
