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Library: GNU bash Command Reference (Darwin 9.0)

ulimit

ulimit: ulimit [-SHacdfilmnpqstuvx] [limit]

Ulimit provides control over the resources available to processes
started by the shell, on systems that allow such control.  If an
option is given, it is interpreted as follows:

-S	use the `soft' resource limit
-H	use the `hard' resource limit
-a	all current limits are reported
-c	the maximum size of core files created
-d	the maximum size of a process's data segment
-e	the maximum scheduling priority (`nice')
-f	the maximum size of files written by the shell and its children
-i	the maximum number of pending signals
-l	the maximum size a process may lock into memory
-m	the maximum resident set size
-n	the maximum number of open file descriptors
-p	the pipe buffer size
-q	the maximum number of bytes in POSIX message queues
-r	the maximum real-time scheduling priority
-s	the maximum stack size
-t	the maximum amount of cpu time in seconds
-u	the maximum number of user processes
-v	the size of virtual memory
-x	the maximum number of file locks

If LIMIT is given, it is the new value of the specified resource;
the special LIMIT values `soft', `hard', and `unlimited' stand for
the current soft limit, the current hard limit, and no limit, respectively.
Otherwise, the current value of the specified resource is printed.
If no option is given, then -f is assumed.  Values are in 1024-byte
increments, except for -t, which is in seconds, -p, which is in
increments of 512 bytes, and -u, which is an unscaled number of
processes.

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