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ulimit(1)							     ulimit(1)

NAME
       ulimit - Sets or reports a resource limit

SYNOPSIS
       ulimit [-HSacdfmnstvw] [limit]

STANDARDS
       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       ulimit:	XCU5.0, XBD5.0

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

OPTIONS
       [Tru64  UNIX]   The limits specified for the resources are hard limits.
       A hard limit cannot be increased once it is set.	  [Tru64  UNIX]	   The
       limits  specified  for the resources are soft limits.  A soft limit can
       be increased up to the value of the hard limit.	[Tru64	UNIX]	 Lists
       all of the current resource limits.  The limit operand is not permitted
       with this option.  [Tru64 UNIX]	 The limit operand specifies the  num‐
       ber  of 512-byte blocks for core dumps.	[Tru64 UNIX]   The limit oper‐
       and specifies the number of Kilobytes for the data area.	 The limit op‐
       erand  specifies	 the  number  of  512-byte blocks for files written by
       child processes (files of any size can be read).	  [Tru64  UNIX]	   The
       limit  operand specifies the number of Kilobytes for the size of physi‐
       cal memory.  [Tru64 UNIX]   The limit operand specifies the  number  of
       file  descriptors.  [Tru64 UNIX]	  The limit operand specifies the num‐
       ber of Kilobytes for the stack area.  [Tru64 UNIX]   The limit  operand
       specifies  the  number  of  seconds to be used by each process.	[Tru64
       UNIX]   The limit operand specifies the number of Kilobytes for virtual
       memory.	 This option is supported only if RLIMIT_VMEM has been defined
       in /usr/include/sys/resource.h at  compile-time.	  [Tru64  UNIX]	   The
       limit  operand  specifies  the  number  of Kilobytes for the swap area.
       This option is supported	 only  if  RLIMIT_SWAP	has  been  defined  in
       /usr/include/sys/resource.h at compile-time.

OPERANDS
       If  no  options are specified, this is the number of 512 byte blocks to
       use as the new limit to file size. Otherwise, it is the	limit  applied
       to the resource indicatd by the option.

	      [Tru64 UNIX]   This operand is not allowed with the -a option.

	      If  this operand is omitted, the current limit for the indicated
	      resource is reported.

DESCRIPTION
       This command sets,  or  reports,	 the  limit  on	 the  size  of	system
       resources, as indicated by the option.

       [Tru64 UNIX]   If neither the -H option nor the -S option is specified,
       the limit applies to both hard and soft limits.	If only the -a	option
       is specified, soft limits are reported.

       If there is no limit on a resource, the limit is reported as unlimited.

NOTES
       The  ulimit  command  affects  only  the current execution environment,
       therefore it has no effect when run in a separate execution environment
       such as one of the following:

       nohup ulimit -f 10000 env ulimit 10000

RESTRICTIONS
       Once  a limit has been decreased, only a user with superuser privileges
       may increase it, even back to its original value.

EXIT STATUS
       The following exit  values  are	returned:  Successful  completion.   A
       request for a higher limit was rejected or an error occurred.

EXAMPLES
       To  set	the  file  size limit to 51,200 bytes, enter: ulimit -f 100 To
       report the current file size limit, enter: ulimit The following example
       displays all current resource limits: % ulimit -a

       time(seconds)		unlimited    file(blocks)	     unlimited
       data(kbytes)	    131072  stack(kbytes)	  2048	memory(kbytes)
       84280  coredump(blocks)	    unlimited  nofiles(descriptors) 4096 vmem‐
       ory(kbytes)	1048576

ENVIRONMENT VARIABLES
       The following environment variables affect  the	execution  of  ulimit:
       Provides	 a  default  value for the internationalization variables that
       are unset or null. If LANG is unset or null,  the  corresponding	 value
       from  the  default  locale is used.  If any of the internationalization
       variables contain an invalid setting, the utility behaves as if none of
       the  variables  had  been defined.  If set to a non-empty string value,
       overrides the values of all the other  internationalization  variables.
       Determines  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).  Determines the locale for the format
       and contents of diagnostic messages written to standard error.	Deter‐
       mines  the location of message catalogues for the processing of LC_MES‐
       SAGES.

SEE ALSO
       Routines:  ulimit(3)

       Standards:  standards(5)

								     ulimit(1)
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