linux sysctl 命令

sysctl man page

NAME
       sysctl - configure kernel parameters at runtime
SYNOPSIS
       sysctl [-n] [-e] variable ...
       sysctl [-n] [-e] [-q] -w variable=value ...
       sysctl [-n] [-e] [-q] -p
       sysctl [-n] [-e] -a
       sysctl [-n] [-e] -A
DESCRIPTION
       sysctl is used modify kernel parameters at runtime.    The parameters
       available are those listed under /proc/sys/. Procfs is     required for
       sysctl(8) support in Linux.    You can use sysctl(8) to both read and
       write sysctl data.
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 form variable=value, where variable is
          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.   This requires the -w
          parameter to use.
       -n     Use this option to disable printing of the key name when print-
          ing values.
       -e     Use this option to ignore errors about unknown keys.
       -N     Use this option to only print the names. It may be useful with
          shells that have programmable completion.
       -q     Use this option to not display the values set to stdout.
       -w     Use this option when you want to change a sysctl setting.
       -p     Load   in      sysctl   settings   from   the   file     specified or
          /etc/sysctl.conf if none given. Specifying - as filename     means
          reading data from standard input.
       -a     Display all values currently available.
       -A     Display all values currently available in table form.
EXAMPLES
       /sbin/sysctl -a
       /sbin/sysctl -n kernel.hostname
       /sbin/sysctl -w kernel.domainname="example.com"
       /sbin/sysctl -p /etc/sysctl.conf
FILES
       /proc/sys /etc/sysctl.conf
SEE ALSO
       sysctl.conf(5)
BUGS
       The -A parameter behaves just as -a does.
AUTHOR
       George Staikos,
                  21 Sep 1999                 SYSCTL(8)