NAME    [Toc]    [Back]

       ulimit - Sets or reports a resource limit

SYNOPSIS    [Toc]    [Back]

       ulimit [-HSacdfmnstvw] [limit]

STANDARDS    [Toc]    [Back]

       Interfaces  documented  on  this reference page conform to
       industry standards as follows:

       ulimit:  XCU5.0, XBD5.0

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

OPTIONS    [Toc]    [Back]

       [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 number of 512-byte blocks  for  core
       dumps.   [Tru64  UNIX]    The  limit operand specifies the
       number of Kilobytes for the data area.  The limit  operand
       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 physical memory.  [Tru64 UNIX]
       The  limit  operand  specifies the number of file descriptors.
  [Tru64 UNIX]   The limit operand specifies the number
  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    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

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

EXIT STATUS    [Toc]    [Back]

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

EXAMPLES    [Toc]    [Back]

       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 vmemory(kbytes)      1048576

ENVIRONMENT VARIABLES    [Toc]    [Back]

       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  multibyte
       characters  in  arguments).  Determines the locale for the
       format and contents  of  diagnostic  messages  written  to
       standard  error.  Determines the location of message catalogues
 for the processing of LC_MESSAGES.

SEE ALSO    [Toc]    [Back]

       Routines:  ulimit(3)

       Standards:  standards(5)



                                                        ulimit(1)