SYSCTL(8) - phpMan

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SYSCTL(8)                                                            SYSCTL(8)

       sysctl - configure kernel parameters at runtime

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

       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.

              The name of a key to read from.  An example is kernel.ostype.  The '/' sepa-
              rator is also accepted in place of a '.'.

              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(s) specified  or  /etc/sysctl.conf  if
              none  given.   Specifying  -  as  filename  means reading data from standard

              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.

       -a     Display all values currently available.

       -A     Same as -a

       /sbin/sysctl -a

       /sbin/sysctl -n kernel.hostname

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

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

       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 mod-

       /proc/sys /etc/sysctl.conf

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

       George Staikos, <staikos AT>

                                  21 Sep 1999                        SYSCTL(8)

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