sysctl man page on Knoppix

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SYSCTL(8)		     System Administration		     SYSCTL(8)

NAME
       sysctl - configure kernel parameters at runtime

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

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.

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.  This requires the -w
	      parameter to use.

       -n, --values
	      Use this option to disable printing of the key name when	print‐
	      ing 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 you want to change a sysctl setting.

       -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 order they are
	      specified.  The file argument can may be	specified  as  reqular
	      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.
	      /run/sysctl.d/*.conf
	      /etc/sysctl.d/*.conf
	      /usr/local/lib/sysctl.d/*.conf
	      /usr/lib/sysctl.d/*.conf
	      /lib/sysctl.d/*.conf
	      /etc/sysctl.conf

       --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 in favour of BSD compatibility.

       -x     Does nothing in favour of BSD compatibility.

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

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

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 --system --pattern '^net.ipv6'

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

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

FILES
       /proc/sys
       /etc/sysctl.conf

SEE ALSO
       sysctl.conf(5) regex(7)

AUTHOR
       George Staikos ⟨staikos@0wned.org⟩

REPORTING BUGS
       Please send bug reports to ⟨procps@freelists.org⟩

procps-ng			   Jan 2012			     SYSCTL(8)
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