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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 dif-
       fer (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 Variables for  the  prece-
              dence 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  exam-
              ple, 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 writ-
              ten 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  lim-
       ited, 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)