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.\" Copyright 1999, George Staikos (staikos@0wned.org)
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.\" This file may be used subject to the terms and conditions of the
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.\" GNU General Public License Version 2, or any later version
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.\" at your option, as published by the Free Software Foundation.
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details."
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.TH SYSCTL 8 "21 Sep 1999" "" ""
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.SH NAME
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sysctl \- configure kernel parameters at runtime
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.SH SYNOPSIS
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.B "sysctl [-n] [-e] variable ..."
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.br
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.B "sysctl [-n] [-e] [-q] -w variable=value ..."
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.br
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.B "sysctl [-n] [-e] [-q] -p <filename>"
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.br
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.B "sysctl [-n] [-e] -a"
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.br
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.B "sysctl [-n] [-e] -A"
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.SH DESCRIPTION
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.B sysctl
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is used to modify kernel parameters at runtime. The parameters available
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are those listed under /proc/sys/. Procfs is required for
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.B sysctl(8)
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support in Linux. You can use
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.B sysctl(8)
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to both read and write sysctl data.
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.SH PARAMETERS
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.TP
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.B "variable"
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The name of a key to read from. An example is kernel.ostype. The '/'
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separator is also accepted in place of a '.'.
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.TP
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.B "variable=value"
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To set a key, use the form variable=value, where variable is the key and
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value is the value to set it to. If the value contains quotes or characters
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which are parsed by the shell, you may need to enclose the value in double
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quotes. This requires the -w parameter to use.
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.TP
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.B "-n"
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Use this option to disable printing of the key name when printing values.
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.TP
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.B "-e"
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Use this option to ignore errors about unknown keys.
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.TP
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.B "-N"
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Use this option to only print the names. It may be useful with shells that
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have programmable completion.
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.TP
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.B "-q"
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Use this option to not display the values set to stdout.
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.TP
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.B "-w"
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Use this option when you want to change a sysctl setting.
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.TP
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.B "-p"
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Load in sysctl settings from the file specified or /etc/sysctl.conf if none given.
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Specifying \- as filename means reading data from standard input.
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.TP
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.B "-a"
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Display all values currently available.
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.TP
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.B "-A"
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Display all values currently available in table form.
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.SH EXAMPLES
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.TP
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/sbin/sysctl -a
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.TP
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/sbin/sysctl -n kernel.hostname
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.TP
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/sbin/sysctl -w kernel.domainname="example.com"
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.TP
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/sbin/sysctl -p /etc/sysctl.conf
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.SH FILES
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.I /proc/sys
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.I /etc/sysctl.conf
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.SH SEE ALSO
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.BR sysctl.conf (5)
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.SH BUGS
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The -A parameter behaves just as -a does.
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.SH AUTHOR
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George Staikos, <staikos@0wned.org>
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