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Diffstat (limited to 'Doc/help/ulimit')
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diff --git a/Doc/help/ulimit b/Doc/help/ulimit new file mode 100644 index 000000000..8f2f63552 --- /dev/null +++ b/Doc/help/ulimit @@ -0,0 +1,59 @@ +ulimit [ -HSa ] [ { -bcdfiklmnpqrsTtvwx | -N resource } [ limit ] ... ] + Set or display resource limits of the shell and the processes + started by the shell. The value of limit can be a number in the + unit specified below or one of the values `unlimited', which re- + moves the limit on the resource, or `hard', which uses the cur- + rent value of the hard limit on the resource. + + By default, only soft limits are manipulated. If the -H flag is + given use hard limits instead of soft limits. If the -S flag is + given together with the -H flag set both hard and soft limits. + + If no options are used, the file size limit (-f) is assumed. + + If limit is omitted the current value of the specified resources + are printed. When more than one resource value is printed, the + limit name and unit is printed before each value. + + When looping over multiple resources, the shell will abort imme- + diately if it detects a badly formed argument. However, if it + fails to set a limit for some other reason it will continue try- + ing to set the remaining limits. + + Not all the following resources are supported on all systems. + Running ulimit -a will show which are supported. + + -a Lists all of the current resource limits. + -b Socket buffer size in bytes (N.B. not kilobytes) + -c 512-byte blocks on the size of core dumps. + -d Kilobytes on the size of the data segment. + -f 512-byte blocks on the size of files written. + -i The number of pending signals. + -k The number of kqueues allocated. + -l Kilobytes on the size of locked-in memory. + -m Kilobytes on the size of physical memory. + -n open file descriptors. + -p The number of pseudo-terminals. + -q Bytes in POSIX message queues. + -r Maximum real time priority. On some systems where this + is not available, such as NetBSD, this has the same ef- + fect as -T for compatibility with sh. + -s Kilobytes on the size of the stack. + -T The number of simultaneous threads available to the user. + -t CPU seconds to be used. + -u The number of processes available to the user. + -v Kilobytes on the size of virtual memory. On some systems + this refers to the limit called `address space'. + -w Kilobytes on the size of swapped out memory. + -x The number of locks on files. + + A resource may also be specified by integer in the form `-N re- + source', where resource corresponds to the integer defined for + the resource by the operating system. This may be used to set + the limits for resources known to the shell which do not corre- + spond to option letters. Such limits will be shown by number in + the output of `ulimit -a'. + + The number may alternatively be out of the range of limits com- + piled into the shell. The shell will try to read or write the + limit anyway, and will report an error if this fails. |