установить или сообщить о предельном размере файла (set or report file size limit)
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)
ulimit — set or report file size limit
Синопсис (Synopsis)
ulimit [-f] [blocks]
Описание (Description)
The ulimit utility shall set or report the file-size writing
limit imposed on files written by the shell and its child
processes (files of any size may be read). Only a process with
appropriate privileges can increase the limit.
Параметры (Options)
The ulimit utility shall conform to the Base Definitions volume
of POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines.
The following option shall be supported:
-f Set (or report, if no blocks operand is present), the
file size limit in blocks. The -f option shall also be
the default case.
Операнды (Operands)
The following operand shall be supported:
blocks The number of 512-byte blocks to use as the new file
size limit.
Стандартный ввод (Stdin)
Not used.
Входные файлы (Input files)
None.
Переменные окружения (Environment variables)
The following environment variables shall affect the execution of
ulimit:
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 standard output shall be used when no blocks operand is
present. If the current number of blocks is limited, the number
of blocks in the current limit shall be written in the following
format:
"%d\n", <number of 512-byte blocks>
If there is no current limit on the number of blocks, in the
POSIX locale the following format shall be used:
"unlimited\n"
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 A request for a higher limit was rejected or an error
occurred.
Последствия ошибок (Consequences of errors)
Default.
The following sections are informative.
Использование в приложениях (Application usage)
Since ulimit affects the current shell execution environment, it
is always provided as a shell regular built-in. If it is called
in a separate utility execution environment, such as one of the
following:
nohup ulimit -f 10000
env ulimit 10000
it does not affect the file size limit of the caller's
environment.
Once a limit has been decreased by a process, it cannot be
increased (unless appropriate privileges are involved), even back
to the original system limit.
Примеры (Examples)
Set the file size limit to 51200 bytes:
ulimit -f 100
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
The Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables, Section 12.2, Utility Syntax Guidelines
The System Interfaces volume of POSIX.1‐2017, ulimit(3p)
