Movatterモバイル変換

NAME

ulimit - set or report file size limit

SYNOPSIS

[XSI] ulimit[-f] [blocks]

DESCRIPTION

Theulimit utility shall set or report the file-size writing limit imposed on files written by the shell and its childprocesses (files of any size may be read). Only a process with appropriate privileges can increase the limit.

OPTIONS

Theulimit utility shall conform to XBDUtility SyntaxGuidelines.

The following option shall be supported:

-f

Set (or report, if noblocks operand is present), the file size limit in blocks. The-f option shall also be thedefault case.

OPERANDS

The following operand shall be supported:

blocks

The number of 512-byte blocks to use as the new file size limit.

STDIN

Not used.

INPUT FILES

None.

ENVIRONMENT VARIABLES

The following environment variables shall affect the execution ofulimit:

LANG

Provide a default value for the internationalization variables that are unset or null. (See XBDInternationalization Variables for the precedence of internationalizationvariables 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 asopposed 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 ofLC_MESSAGES.

ASYNCHRONOUS EVENTS

Default.

STDOUT

The standard output shall be used when noblocks operand is present. If the current number of blocks is limited, thenumber 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"

STDERR

The standard error shall be used only for diagnostic messages.

OUTPUT FILES

None.

EXTENDED DESCRIPTION

None.

EXIT STATUS

The following exit values shall be returned:

 0

Successful completion.

>0

A request for a higher limit was rejected or an error occurred.

CONSEQUENCES OF ERRORS

Default.

APPLICATION USAGE

Sinceulimit affects the current shell execution environment, it is always provided as a shell regular built-in. If it iscalled in a separate utility execution environment, such as one of the following:

nohup ulimit -f 10000env 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 tothe original system limit.

EXAMPLES

Set the file size limit to 51200 bytes:

ulimit -f 100

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

XBDEnvironment Variables,Utility Syntax Guidelines

XSHulimit

CHANGE HISTORY

First released in Issue 2.

Issue 7

SD5-XCU-ERN-97 is applied, updating the SYNOPSIS.