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 printing 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.

	      Include deprecated parameters to --all values listing.

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

	      Load settings from all system configuration files.

       --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 dep-
       recated 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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