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SYSCTL(8)							     SYSCTL(8)



NAME
       sysctl - configure kernel parameters at runtime

SYNOPSIS
       sysctl [-n] [-e] variable ...
       sysctl [-n] [-e] [-q] -w variable=value ...
       sysctl [-n] [-e] [-q] -p <filename>
       sysctl [-n] [-e] -a
       sysctl [-n] [-e] -A

DESCRIPTION
       sysctl  is used to 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 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     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     Same as -a

EXAMPLES
       /sbin/sysctl -a

       /sbin/sysctl -n kernel.hostname

       /sbin/sysctl -w kernel.domainname="example.com"

       /sbin/sysctl -p /etc/sysctl.conf

NOTES
       Please  note  that  modules loaded after sysctl is run may override the
       settings (example: sunrpc.* settings are	 overridden  when  the	sunrpc
       module  is  loaded). This may cause some confusion during boot when the
       settings in sysctl.conf may be overriden. To prevent such a  situation,
       sysctl  must  be	 run after the particular module is loaded (e.g., from
       /etc/rc.d/rc.local or by using the install directive in modprobe.conf)

FILES
       /proc/sys /etc/sysctl.conf

SEE ALSO
       sysctl.conf(5), modprobe.conf(5)

AUTHOR
       George Staikos, <staikos@0wned.org>




				  21 Sep 1999			     SYSCTL(8)
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