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   sysctl    ( 8 )

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Имя (Name)

sysctl - configure kernel parameters at runtime

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Синопсис (Synopsis)

sysctl [options] [variable[=value]] [...] sysctl -p [file or regexp] [...]

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Описание (Description)

sysctl is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. Procfs is required for sysctl support in Linux. You can use sysctl to both read and write sysctl data.

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Параметры (Parameters)

variable
              The name of a key to read from.  An example is
              kernel.ostype.  The '/' separator is also accepted in
              place of a '.'.

       variable=value
              To set a key, use the form variable=value where variable
              is the key and value is the value to set it to.  If the
              value contains quotes or characters which are parsed by
              the shell, you may need to enclose the value in double
              quotes.

       -n, --values
              Use this option to disable printing of the key name when
              printing values.

       -e, --ignore
              Use this option to ignore errors about unknown keys.

       -N, --names
              Use this option to only print the names.  It may be useful
              with shells that have programmable completion.

       -q, --quiet
              Use this option to not display the values set to stdout.

       -w, --write
              Use this option when all arguments prescribe a key to be
              set.

       -p[FILE], --load[=FILE]
              Load in sysctl settings from the file specified or
              /etc/sysctl.conf if none given.  Specifying - as filename
              means reading data from standard input.  Using this option
              will mean arguments to sysctl are files, which are read in
              the order they are specified.  The file argument may be
              specified as regular expression.

       -a, --all
              Display all values currently available.

       --deprecated
              Include deprecated parameters to --all values listing.

       -b, --binary
              Print value without new line.

       --system
              Load settings from all system configuration files. Files
              are read from directories in the following list in given
              order from top to bottom.  Once a file of a given filename
              is loaded, any file of the same name in subsequent
              directories is ignored.
              /etc/sysctl.d/*.conf
              /run/sysctl.d/*.conf
              /usr/local/lib/sysctl.d/*.conf
              /usr/lib/sysctl.d/*.conf
              /lib/sysctl.d/*.conf
              /etc/sysctl.conf

       -r, --pattern pattern
              Only apply settings that match pattern.  The pattern uses
              extended regular expression syntax.

       -A     Alias of -a

       -d     Alias of -h

       -f     Alias of -p

       -X     Alias of -a

       -o     Does nothing, exists for BSD compatibility.

       -x     Does nothing, exists for BSD compatibility.

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information and exit.

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Примеры (Examples)

/sbin/sysctl -a
       /sbin/sysctl -n kernel.hostname
       /sbin/sysctl -w kernel.domainname="example.com"
       /sbin/sysctl -p/etc/sysctl.conf
       /sbin/sysctl -a --pattern forward
       /sbin/sysctl -a --pattern forward$
       /sbin/sysctl -a --pattern 'net.ipv4.conf.(eth|wlan)0.arp'
       /sbin/sysctl  --pattern '^net.ipv6' --system

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DEPRECATED PARAMETERS

The base_reachable_time and retrans_time are deprecated. The sysctl command does not allow changing values of these parameters. Users who insist to use deprecated kernel interfaces should push values to /proc file system by other means. For example:

echo 256 > /proc/sys/net/ipv6/neigh/eth0/base_reachable_time

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Файлы (Files)

/proc/sys /etc/sysctl.d/*.conf /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf

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Смотри также (See also)

sysctl.conf(5) regex(7)

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