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SYSCTL(8)		     System Administration		     SYSCTL(8)

       sysctl - configure kernel parameters at runtime

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

       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.

	      The name of a key to read from.  An  example  is	kernel.ostype.
	      The '/' separator 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, --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

       -a, --all
	      Display all values currently available.

	      Include deprecated parameters to --all values listing.

       -b, --binary
	      Print value without new line.

	      Load settings from all system configuration files.

       -r, --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.

       /sbin/sysctl -a
       /sbin/sysctl -n kernel.hostname
       /sbin/sysctl -w kernel.domainname=""
       /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'

       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


       sysctl.conf(5) regex(7)

       George Staikos ⟨⟩

       Please send bug reports to ⟨⟩

procps-ng			   Jan 2012			     SYSCTL(8)

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