{"id":3533,"date":"2022-12-20T17:08:56","date_gmt":"2022-12-20T20:08:56","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/sysctl-man8\/"},"modified":"2022-12-20T17:08:56","modified_gmt":"2022-12-20T20:08:56","slug":"sysctl-man8","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/sysctl-man8\/","title":{"rendered":"SYSCTL (man8)"},"content":{"rendered":"

SYSCTL<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
PARAMETERS<\/a>
EXAMPLES<\/a>
DEPRECATED PARAMETERS<\/a>
FILES<\/a>
SEE ALSO<\/a>
AUTHOR<\/a>
REPORTING BUGS<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

sysctl \u2212 configure kernel parameters at runtime<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

sysctl<\/b> [options<\/i>] [variable<\/i>[=<\/b>value<\/i>]] […]
sysctl \u2212p<\/b> [file<\/i> or regexp<\/i>] […]<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

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

PARAMETERS <\/a> <\/h2>\n

variable<\/i><\/p>\n

The name of a key to read from. An example is kernel.ostype. The \u2019\/\u2019 separator is also accepted in place of a \u2019.\u2019.<\/p>\n

variable<\/i>=value<\/i><\/p>\n

To set a key, use the form variable<\/i>=value<\/i> where variable<\/i> is the key and value<\/i> 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.<\/p>\n

\u2212n<\/b>, \u2212\u2212values<\/b><\/p>\n

Use this option to disable printing of the key name when printing values.<\/p>\n

\u2212e<\/b>, \u2212\u2212ignore<\/b><\/p>\n

Use this option to ignore errors about unknown keys.<\/p>\n

\u2212N<\/b>, \u2212\u2212names<\/b><\/p>\n

Use this option to only print the names. It may be useful with shells that have programmable completion.<\/p>\n

\u2212q<\/b>, \u2212\u2212quiet<\/b><\/p>\n

Use this option to not display the values set to stdout.<\/p>\n

\u2212w<\/b>, \u2212\u2212write<\/b><\/p>\n

Use this option when all arguments prescribe a key to be set.<\/p>\n

\u2212p<\/b>[FILE<\/i>], \u2212\u2212load<\/b>[=FILE<\/i>]<\/p>\n

Load in sysctl settings from the file specified or \/etc\/sysctl.conf if none given. Specifying \u2212 as filename means reading data from standard input. Using this option will mean arguments to sysctl<\/b> are files, which are read in the order they are specified. The file argument may be specified as regular expression.<\/p>\n

\u2212a<\/b>, \u2212\u2212all<\/b><\/p>\n

Display all values currently available.<\/p>\n

\u2212\u2212deprecated<\/b><\/p>\n

Include deprecated parameters to \u2212\u2212all<\/b> values listing.<\/p>\n

\u2212b<\/b>, \u2212\u2212binary<\/b><\/p>\n

Print value without new line.<\/p>\n

\u2212\u2212system<\/b><\/p>\n

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\/51-alt-sysrq.conf \/etc\/sysctl.d\/51-drakx.conf
\/run\/sysctl.d\/*.conf
\/usr\/local\/lib\/sysctl.d\/*.conf
\/usr\/lib\/sysctl.d\/50-default.conf \/usr\/lib\/sysctl.d\/50-libreswan.conf \/usr\/lib\/sysctl.d\/50-pid-max.conf
\/lib\/sysctl.d\/50-default.conf \/lib\/sysctl.d\/50-libreswan.conf \/lib\/sysctl.d\/50-pid-max.conf
\/etc\/sysctl.conf<\/p>\n

\u2212r<\/b>, \u2212\u2212pattern<\/b> pattern<\/i><\/p>\n

Only apply settings that match pattern<\/i>. The pattern<\/i> uses extended regular expression syntax.<\/p>\n\n\n\n\n\n\n\n
<\/td>\n\n

\u2212A<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Alias of \u2212a<\/b><\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

\u2212d<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Alias of \u2212h<\/b><\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

\u2212f<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Alias of \u2212p<\/b><\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

\u2212X<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Alias of \u2212a<\/b><\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

\u2212o<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Does nothing, exists for BSD compatibility.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

\u2212x<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Does nothing, exists for BSD compatibility.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

\u2212h<\/b>, \u2212\u2212help<\/b><\/p>\n

Display help text and exit.<\/p>\n

\u2212V<\/b>, \u2212\u2212version<\/b><\/p>\n

Display version information and exit.<\/p>\n

EXAMPLES <\/a> <\/h2>\n

\/sbin\/sysctl \u2212a
\/sbin\/sysctl \u2212n kernel.hostname
\/sbin\/sysctl \u2212w kernel.domainname=”example.com”
\/sbin\/sysctl \u2212p\/etc\/sysctl.conf
\/sbin\/sysctl \u2212a \u2212\u2212pattern forward
\/sbin\/sysctl \u2212a \u2212\u2212pattern forward$
\/sbin\/sysctl \u2212a \u2212\u2212pattern \u2019net.ipv4.conf.(eth|wlan)0.arp\u2019
\/sbin\/sysctl \u2212\u2212system \u2212\u2212pattern \u2019^net.ipv6\u2019<\/p>\n

DEPRECATED PARAMETERS <\/a> <\/h2>\n

The base_reachable_time<\/b> and retrans_time<\/b> are deprecated. The sysctl<\/b> 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:<\/p>\n

echo 256 > \/proc\/sys\/net\/ipv6\/neigh\/eth0\/base_reachable_time<\/p>\n

FILES <\/a> <\/h2>\n

\/proc\/sys
\/etc\/sysctl.d\/51-alt-sysrq.conf \/etc\/sysctl.d\/51-drakx.conf
\/run\/sysctl.d\/*.conf
\/usr\/local\/lib\/sysctl.d\/*.conf
\/usr\/lib\/sysctl.d\/50-default.conf \/usr\/lib\/sysctl.d\/50-libreswan.conf \/usr\/lib\/sysctl.d\/50-pid-max.conf
\/lib\/sysctl.d\/50-default.conf \/lib\/sysctl.d\/50-libreswan.conf \/lib\/sysctl.d\/50-pid-max.conf
\/etc\/sysctl.conf<\/i><\/p>\n

SEE ALSO <\/a> <\/h2>\n

sysctl.conf<\/b><\/i>(5) regex<\/b>(7)<\/p>\n

AUTHOR <\/a> <\/h2>\n

George Staikos<\/a><\/p>\n

REPORTING BUGS <\/a> <\/h2>\n

Please send bug reports to procps@freelists.org<\/a><\/p>\n

\n","protected":false},"excerpt":{"rendered":"

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