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67 lines
3.5 KiB
Plaintext
67 lines
3.5 KiB
Plaintext
\section ulimit ulimit - set or get the shells resource usage limits
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\subsection ulimit-synopsis Synopsis
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<tt>ulimit [OPTIONS] [LIMIT]</tt>
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\subsection ulimit-description Description
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The ulimit builtin is used to set the resource usage limits of the
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shell and any processes spawned by it. If a new limit value is
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omitted, the current value of the limit of the resource is printed.
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Use one of the following switches to specify which resource limit to set or report:
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- <code>-c</code> or <code>--core-size</code> The maximum size of core files created
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- <code>-d</code> or <code>--data-size</code> The maximum size of a process's data segment
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- <code>-f</code> or <code>--file-size</code> The maximum size of files created by the shell
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- <code>-l</code> or <code>--lock-size</code> The maximum size that may be locked into memory
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- <code>-m</code> or <code>--resident-set-size</code> The maximum resident set size
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- <code>-n</code> or <code>--file-descriptor-count</code> The maximum number of open file descriptors (most systems do not allow this value to be set)
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- <code>-s</code> or <code>--stack-size</code> The maximum stack size
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- <code>-t</code> or <code>--cpu-time</code> The maximum amount of cpu time in seconds
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- <code>-u</code> or <code>--process-count</code> The maximum number of processes available to a single user
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- <code>-v</code> or <code>--virtual-memory-size</code> The maximum amount of virtual memory available to the shell. If supported by OS.
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Note that not all these limits are available in all operating systems.
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The value of limit can be a number in the unit specified for
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the resource or one of the special values hard, soft, or unlimited,
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which stand for the current hard limit, the current soft limit, and no
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limit, respectively.
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If limit is given, it is the new value of the specified resource. If
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no option is given, then -f is assumed. Values are in kilobytes,
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except for -t, which is in seconds and -n and -u, which are unscaled
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values. The return status is 0 unless an invalid option or argument is
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supplied, or an error occurs while setting a new limit.
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ulimit also accepts the following switches that determine what type of limit to set:
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- <code>-H</code> or <code>--hard</code> Set hard resource limit
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- <code>-S</code> or <code>--soft</code> Set soft resource limit
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A hard limit cannot be increased once it is set; a soft limit may be
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increased up to the value of the hard limit. If neither -H nor -S is
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specified, both the soft and hard limits are updated when assigning a
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new limit value, and the soft limit is used when reporting the current
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value.
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The following additional options are also understood by ulimit:
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- <code>-a</code> or <code>--all</code> Print all current limits
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- <code>-h</code> or <code>--help</code> Display help and exit
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The fish implementation of ulimit should behave identically to the
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implementation in bash, except for these differences:
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- Fish ulimit supports GNU-style long options for all switches
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- Fish ulimit does not support the -p option for getting the pipe size. The bash implementation consists of a compile-time check that empirically guesses this number by writing to a pipe and waiting for SIGPIPE. Depending on bash version, there may also be further additional limits to set in bash that do not exist in fish.
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- Fish ulimit does not support getting or setting multiple limits in one command, except reporting all values using the -a switch
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\subsection ulimit-example Example
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<tt>ulimit -Hs 64</tt>
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would set the hard stack size limit to 64 kB:
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