sysctl - phpMan

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 '/' sepa-
              rator 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 printing 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. Please see the NOTES.

       -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
       Avoid  using  the  -a and -A options if possible. Using these options may result in
       kernel warnings about using a deprecated sysctl.

       Also 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  over-
       riden.  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 AT 0wned.org>




                                  21 Sep 1999                        SYSCTL(8)

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