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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
This file is Copyright (c) 2010 by the GPSD project
BSD terms apply: see the file COPYING in the distribution root for details.
-->
<!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<refentry id='gpsdctl.8'>
<refentryinfo><date>25 Jun 2011</date></refentryinfo>
<refmeta>
<refentrytitle>gpsdctl</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">The GPSD Project</refmiscinfo>
<refmiscinfo class="manual">GPSD Documentation</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>gpsdctl</refname>
<refpurpose>tool for sending commands to gpsd over its control socket</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>gpdsctl</command>
<arg choice='plain'><replaceable>action</replaceable></arg>
<arg choice='plain'><replaceable>device</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'><title>DESCRIPTION</title>
<para>This is a tool for sending an instance of
<application>gpsd</application> commands over its control socket to
add or remove devices from the daemon's device list. It is not
intended to be called by users, but rather by the Linux hotplug
system and similar facilities.</para>
<para>The action argument may be "add" or "remove". If no daemon
instance is running when an add is requested, this program will launch
one.</para>
<para>The "device" argument should be the pathname of a device. A
device on the list will be opened to read sensor data whenever a
client requests a watch.</para>
<para>Two environment variables are
interpreted. <envar>GPSD_SOCKET</envar> sets the location of the
control socket. It defaults to <filename>/var/run/gpsd.sock</filename>.</para>
<para><envar>GPSD_OPTIONS</envar>
may be a list of options to be passed to <application>gpsd</application>
when this tool launches it. It defaults to an empty string.</para>
</refsect1>
<refsect1 id='see_also'><title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>gpsd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpsctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gps</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>libgps</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>libgpsd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpsprof</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>gpsfake</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1 id='maintainer'><title>AUTHOR</title>
<para>Eric S. Raymond <email>esr@thyrsus.com</email>.</para>
</refsect1>
</refentry>
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