This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       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.

       Default.

       Default.

       Thefollowingsectionsareinformative.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                        ULIMIT(1POSIX)

       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.

       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 POSIX.1‐2017, Section8.2, InternationalizationVariables 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.

       Set the file size limit to 51200 bytes:

           ulimit -f 100

       The following exit values shall be returned:

        0    Successful completion.

       >0    A request for a higher limit was rejected or an error occurred.

       None.

       None.

       None.

       ulimit — set or report file size limit

       The following operand shall be supported:

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

       The  ulimit  utility  shall conform to the Base Definitions volume of POSIX.1‐2017, Section12.2, UtilitySyntaxGuidelines.

       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.

       None.

       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.

       None.

       The Base Definitions volume of POSIX.1‐2017, Chapter8,  EnvironmentVariables,  Section12.2,  UtilitySyntaxGuidelines

       The System Interfaces volume of POSIX.1‐2017, ulimit()

       The standard error shall be used only for diagnostic messages.

       Not used.

       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", <numberof512-byteblocks>

       If  there  is no current limit on the number of blocks, in the POSIX locale the following format shall be
       used:

           "unlimited\n"

       ulimit [-f][blocks]