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

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 writ-
       ten 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, Inter-
	      nationalization 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  interna-
	      tionalization 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  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic 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 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.

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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					ULIMIT(P)
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