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ULIMIT(1P)		   POSIX Programmer's Manual		    ULIMIT(1P)

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.

NAME
       ulimit -	set or report file size	limit

SYNOPSIS
       ulimit [-f][blocks]

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.

OPTIONS
       The  ulimit  utility  shall  conform  to	the Base Definitions volume of
       IEEE Std	1003.1-2001, 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.

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  of
       ulimit:

       LANG   Provide  a  default value	for the	internationalization variables
	      that are unset or	null. (See  the	 Base  Definitions  volume  of
	      IEEE Std 1003.1-2001,  Section  8.2,  Internationalization Vari-
	      ables 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 .

ASYNCHRONOUS EVENTS
       Default.

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"

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.

       The following sections are informative.

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 sepa-
       rate 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.

EXAMPLES
       Set the file size limit to 51200	bytes:

	      ulimit -f	100

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of IEEE Std	1003.1-2001, ulimit()

COPYRIGHT
       Portions	of this	text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for	Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 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 .

IEEE/The Open Group		     2003			    ULIMIT(1P)

PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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