mirror of https://github.com/mkerrisk/man-pages
174 lines
4.3 KiB
Groff
174 lines
4.3 KiB
Groff
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "ULIMIT" 1P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" ulimit
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.SH NAME
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ulimit \- set or report file size limit
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.SH SYNOPSIS
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.LP
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\fBulimit\fP \fB[\fP\fB-f\fP\fB][\fP\fIblocks\fP\fB]\fP\fB\fP
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.SH DESCRIPTION
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.LP
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The \fIulimit\fP utility shall set or report the file-size writing
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limit imposed on files written by the shell and its child
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processes (files of any size may be read). Only a process with appropriate
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privileges can increase the limit.
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.SH OPTIONS
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.LP
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The \fIulimit\fP utility shall conform to the Base Definitions volume
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of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
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.LP
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The following option shall be supported:
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.TP 7
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\fB-f\fP
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Set (or report, if no \fIblocks\fP operand is present), the file size
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limit in blocks. The \fB-f\fP option shall also be the
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default case.
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.sp
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.SH OPERANDS
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.LP
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The following operand shall be supported:
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.TP 7
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\fIblocks\fP
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The number of 512-byte blocks to use as the new file size limit.
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.sp
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.SH STDIN
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.LP
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Not used.
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.SH INPUT FILES
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.LP
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None.
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.SH ENVIRONMENT VARIABLES
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.LP
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The following environment variables shall affect the execution of
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\fIulimit\fP:
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.TP 7
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\fILANG\fP
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Provide a default value for the internationalization variables that
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are unset or null. (See the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
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for
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the precedence of internationalization variables used to determine
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the values of locale categories.)
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.TP 7
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\fILC_ALL\fP
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If set to a non-empty string value, override the values of all the
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other internationalization variables.
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.TP 7
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\fILC_CTYPE\fP
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Determine the locale for the interpretation of sequences of bytes
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of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).
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.TP 7
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\fILC_MESSAGES\fP
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Determine the locale that should be used to affect the format and
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contents of diagnostic messages written to standard
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error.
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.TP 7
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\fINLSPATH\fP
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Determine the location of message catalogs for the processing of \fILC_MESSAGES
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\&.\fP
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.sp
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.SH ASYNCHRONOUS EVENTS
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.LP
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Default.
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.SH STDOUT
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.LP
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The standard output shall be used when no \fIblocks\fP operand is
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present. If the current number of blocks is limited, the
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number of blocks in the current limit shall be written in the following
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format:
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.sp
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.RS
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.nf
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\fB"%d\\n", <\fP\fInumber of 512-byte blocks\fP\fB>
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\fP
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.fi
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.RE
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.LP
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If there is no current limit on the number of blocks, in the POSIX
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locale the following format shall be used:
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.sp
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.RS
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.nf
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\fB"unlimited\\n"
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\fP
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.fi
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.RE
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.SH STDERR
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.LP
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The standard error shall be used only for diagnostic messages.
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.SH OUTPUT FILES
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.LP
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None.
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.SH EXTENDED DESCRIPTION
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.LP
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None.
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.SH EXIT STATUS
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.LP
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The following exit values shall be returned:
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.TP 7
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\ 0
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Successful completion.
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.TP 7
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>0
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A request for a higher limit was rejected or an error occurred.
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.sp
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.SH CONSEQUENCES OF ERRORS
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.LP
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Default.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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Since \fIulimit\fP affects the current shell execution environment,
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it is always provided as a shell regular built-in. If it is
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called in a separate utility execution environment, such as one of
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the following:
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.sp
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.RS
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.nf
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\fBnohup ulimit -f 10000
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env ulimit 10000
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\fP
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.fi
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.RE
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.LP
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it does not affect the file size limit of the caller's environment.
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.LP
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Once a limit has been decreased by a process, it cannot be increased
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(unless appropriate privileges are involved), even back to
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the original system limit.
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.SH EXAMPLES
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.LP
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Set the file size limit to 51200 bytes:
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.sp
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.RS
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.nf
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\fBulimit -f 100
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\fP
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.fi
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.RE
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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The System Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIulimit\fP()
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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