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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>udevadm</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="udevadm"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>udevadm — udev management tool</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">udevadm</code> [<code class="option">--debug</code>] [<code class="option">--version</code>] [<code class="option">--help</code>]</p></div><div class="cmdsynopsis"><p><code class="command">udevadm info <em class="replaceable"><code>options</code></em></code> </p></div><div class="cmdsynopsis"><p><code class="command">udevadm trigger [<span class="optional">options</span>]</code> </p></div><div class="cmdsynopsis"><p><code class="command">udevadm settle [<span class="optional">options</span>]</code> </p></div><div class="cmdsynopsis"><p><code class="command">udevadm control <em class="replaceable"><code>command</code></em></code> </p></div><div class="cmdsynopsis"><p><code class="command">udevadm monitor [<span class="optional">options</span>]</code> </p></div><div class="cmdsynopsis"><p><code class="command">udevadm test [<span class="optional">options</span>] <em class="replaceable"><code>devpath</code></em></code> </p></div><div class="cmdsynopsis"><p><code class="command">udevadm test-builtin [<span class="optional">options</span>] <em class="replaceable"><code>command</code></em> <em class="replaceable"><code>devpath</code></em></code> </p></div></div><div class="refsect1"><a name="idm139843308598960"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description"></a></h2><p><span class="command"><strong>udevadm</strong></span> expects a command and command
specific options. It controls the runtime behavior of
<span class="command"><strong>systemd-udevd</strong></span>, requests kernel events, manages
the event queue, and provides simple debugging mechanisms.</p></div><div class="refsect1"><a name="idm139843308596432"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options"></a></h2><div class="variablelist"><dl class="variablelist"><dt id="--debug"><span class="term"><code class="option">--debug</code></span><a class="headerlink" title="Permalink to this term" href="#--debug"></a></dt><dd><p>Print debug messages to standard error.</p></dd><dt id="--version"><span class="term"><code class="option">--version</code></span><a class="headerlink" title="Permalink to this term" href="#--version"></a></dt><dd><p>Print version number.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div><div class="refsect2"><a name="idm139843308589840"></a><h3 id="udevadm info
[options]
[devpath|file]
">udevadm info
[<em class="replaceable"><code>options</code></em>]
[<em class="replaceable"><code>devpath</code></em>|<em class="replaceable"><code>file</code></em>]
<a class="headerlink" title="Permalink to this headline" href="#udevadm%20info%0A%20%20%20%20%20%20%5Boptions%5D%0A%20%20%20%20%20%20%20%5Bdevpath%7Cfile%5D%0A%20%20%20%20"></a></h3><p>Queries the udev database for device information
stored in the udev database. It can also query the properties
of a device from its sysfs representation to help creating udev
rules that match this device.</p><div class="variablelist"><dl class="variablelist"><dt id="-q"><span class="term"><code class="option">-q</code>, </span><span class="term"><code class="option">--query=<em class="replaceable"><code>TYPE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-q"></a></dt><dd><p>Query the database for the specified type of device
data. It needs the <code class="option">--path</code> or
<code class="option">--name</code> to identify the specified device.
Valid <em class="replaceable"><code>TYPE</code></em>s are:
<code class="constant">name</code>, <code class="constant">symlink</code>,
<code class="constant">path</code>, <code class="constant">property</code>,
<code class="constant">all</code>.</p></dd><dt id="-p"><span class="term"><code class="option">-p</code>, </span><span class="term"><code class="option">--path=<em class="replaceable"><code>DEVPATH</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-p"></a></dt><dd><p>The <code class="filename">/sys</code> path of the device to
query, e.g.
<code class="filename">[<span class="optional">/sys</span>]/class/block/sda</code>.
Note that this option usually is not very useful, since
<span class="command"><strong>udev</strong></span> can guess the type of the
argument, so <span class="command"><strong>udevadm
--devpath=/class/block/sda</strong></span> is equivalent to
<span class="command"><strong>udevadm /sys/class/block/sda</strong></span>.</p></dd><dt id="-n"><span class="term"><code class="option">-n</code>, </span><span class="term"><code class="option">--name=<em class="replaceable"><code>FILE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-n"></a></dt><dd><p>The name of the device node or a symlink to query,
e.g. <code class="filename">[<span class="optional">/dev</span>]/sda</code>.
Note that this option usually is not very useful, since
<span class="command"><strong>udev</strong></span> can guess the type of the
argument, so <span class="command"><strong>udevadm --name=sda</strong></span> is
equivalent to <span class="command"><strong>udevadm /dev/sda</strong></span>.</p></dd><dt id="-r"><span class="term"><code class="option">-r</code>, </span><span class="term"><code class="option">--root</code></span><a class="headerlink" title="Permalink to this term" href="#-r"></a></dt><dd><p>Print absolute paths in <span class="command"><strong>name</strong></span> or <span class="command"><strong>symlink</strong></span>
query.</p></dd><dt id="-a"><span class="term"><code class="option">-a</code>, </span><span class="term"><code class="option">--attribute-walk</code></span><a class="headerlink" title="Permalink to this term" href="#-a"></a></dt><dd><p>Print all sysfs properties of the specified device that can be used
in udev rules to match the specified device. It prints all devices
along the chain, up to the root of sysfs that can be used in udev rules.</p></dd><dt id="-x"><span class="term"><code class="option">-x</code>, </span><span class="term"><code class="option">--export</code></span><a class="headerlink" title="Permalink to this term" href="#-x"></a></dt><dd><p>Print output as key/value pairs. Values are enclosed in single quotes.</p></dd><dt id="-P"><span class="term"><code class="option">-P</code>, </span><span class="term"><code class="option">--export-prefix=<em class="replaceable"><code>NAME</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-P"></a></dt><dd><p>Add a prefix to the key name of exported values.</p></dd><dt id="-d"><span class="term"><code class="option">-d</code>, </span><span class="term"><code class="option">--device-id-of-file=<em class="replaceable"><code>FILE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-d"></a></dt><dd><p>Print major/minor numbers of the underlying device, where the file
lives on.</p></dd><dt id="-e"><span class="term"><code class="option">-e</code>, </span><span class="term"><code class="option">--export-db</code></span><a class="headerlink" title="Permalink to this term" href="#-e"></a></dt><dd><p>Export the content of the udev database.</p></dd><dt id="-c"><span class="term"><code class="option">-c</code>, </span><span class="term"><code class="option">--cleanup-db</code></span><a class="headerlink" title="Permalink to this term" href="#-c"></a></dt><dd><p>Cleanup the udev database.</p></dd><dt id="--version"><span class="term"><code class="option">--version</code></span><a class="headerlink" title="Permalink to this term" href="#--version"></a></dt><dd><p>Print version.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div><p>In addition an optional positional argument can be used
to specify a device name or a sys path. It must start with
<code class="filename">/dev</code> or <code class="filename">/sys</code>
respectively.</p></div><div class="refsect2"><a name="idm139843303568192"></a><h3 id="udevadm trigger
[options]
[devpath|file...]">udevadm trigger
[<em class="replaceable"><code>options</code></em>]
[<em class="replaceable"><code>devpath</code></em>|<em class="replaceable"><code>file</code></em>...]<a class="headerlink" title="Permalink to this headline" href="#udevadm%20trigger%0A%20%20%20%20%20%20%5Boptions%5D%0A%20%20%20%20%20%20%20%5Bdevpath%7Cfile...%5D"></a></h3><p>Request device events from the kernel. Primarily used to replay events at system coldplug time.</p><div class="variablelist"><dl class="variablelist"><dt id="-v"><span class="term"><code class="option">-v</code>, </span><span class="term"><code class="option">--verbose</code></span><a class="headerlink" title="Permalink to this term" href="#-v"></a></dt><dd><p>Print the list of devices which will be triggered.</p></dd><dt id="-n"><span class="term"><code class="option">-n</code>, </span><span class="term"><code class="option">--dry-run</code></span><a class="headerlink" title="Permalink to this term" href="#-n"></a></dt><dd><p>Do not actually trigger the event.</p></dd><dt id="-t"><span class="term"><code class="option">-t</code>, </span><span class="term"><code class="option">--type=<em class="replaceable"><code>TYPE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-t"></a></dt><dd><p>Trigger a specific type of devices. Valid types are:
<span class="command"><strong>devices</strong></span>, <span class="command"><strong>subsystems</strong></span>.
The default value is <span class="command"><strong>devices</strong></span>.</p></dd><dt id="-c"><span class="term"><code class="option">-c</code>, </span><span class="term"><code class="option">--action=<em class="replaceable"><code>ACTION</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-c"></a></dt><dd><p>Type of event to be triggered. The default value is
<span class="command"><strong>change</strong></span>.</p></dd><dt id="-s"><span class="term"><code class="option">-s</code>, </span><span class="term"><code class="option">--subsystem-match=<em class="replaceable"><code>SUBSYSTEM</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-s"></a></dt><dd><p>Trigger events for devices which belong to a
matching subsystem. This option can be specified multiple
times and supports shell style pattern matching.</p></dd><dt id="-S"><span class="term"><code class="option">-S</code>, </span><span class="term"><code class="option">--subsystem-nomatch=<em class="replaceable"><code>SUBSYSTEM</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-S"></a></dt><dd><p>Do not trigger events for devices which belong to a matching subsystem. This option
can be specified multiple times and supports shell style pattern matching.</p></dd><dt id="-a"><span class="term"><code class="option">-a</code>, </span><span class="term"><code class="option">--attr-match=<em class="replaceable"><code>ATTRIBUTE</code></em>=<em class="replaceable"><code>VALUE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-a"></a></dt><dd><p>Trigger events for devices with a matching sysfs
attribute. If a value is specified along with the
attribute name, the content of the attribute is matched
against the given value using shell style pattern
matching. If no value is specified, the existence of the
sysfs attribute is checked. This option can be specified
multiple times.</p></dd><dt id="-A"><span class="term"><code class="option">-A</code>, </span><span class="term"><code class="option">--attr-nomatch=<em class="replaceable"><code>ATTRIBUTE</code></em>=<em class="replaceable"><code>VALUE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-A"></a></dt><dd><p>Do not trigger events for devices with a matching
sysfs attribute. If a value is specified along with the
attribute name, the content of the attribute is matched
against the given value using shell style pattern
matching. If no value is specified, the existence of the
sysfs attribute is checked. This option can be specified
multiple times.</p></dd><dt id="-p"><span class="term"><code class="option">-p</code>, </span><span class="term"><code class="option">--property-match=<em class="replaceable"><code>PROPERTY</code></em>=<em class="replaceable"><code>VALUE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-p"></a></dt><dd><p>Trigger events for devices with a matching property
value. This option can be specified multiple times and
supports shell style pattern matching.</p></dd><dt id="-g"><span class="term"><code class="option">-g</code>, </span><span class="term"><code class="option">--tag-match=<em class="replaceable"><code>PROPERTY</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-g"></a></dt><dd><p>Trigger events for devices with a matching tag. This
option can be specified multiple times.</p></dd><dt id="-y"><span class="term"><code class="option">-y</code>, </span><span class="term"><code class="option">--sysname-match=<em class="replaceable"><code>PATH</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-y"></a></dt><dd><p>Trigger events for devices with a matching sys
device path. This option can be specified multiple times
and supports shell style pattern matching.</p></dd><dt id="--name-match=NAME"><span class="term"><code class="option">--name-match=<em class="replaceable"><code>NAME</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#--name-match=NAME"></a></dt><dd><p>Trigger events for devices with a matching
device path. This options can be specified multiple
times.</p></dd><dt id="-b"><span class="term"><code class="option">-b</code>, </span><span class="term"><code class="option">--parent-match=<em class="replaceable"><code>SYSPATH</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-b"></a></dt><dd><p>Trigger events for all children of a given
device.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div><p>In addition optional positional arguments can be used
to specify device names or sys paths. They must start with
<code class="filename">/dev</code> or <code class="filename">/sys</code>
respectively.</p></div><div class="refsect2"><a name="idm139843303515824"></a><h3 id="udevadm settle
[options]
">udevadm settle
[<em class="replaceable"><code>options</code></em>]
<a class="headerlink" title="Permalink to this headline" href="#udevadm%20settle%0A%20%20%20%20%20%20%5Boptions%5D%0A%20%20%20%20"></a></h3><p>Watches the udev event queue, and exits if all current events are handled.</p><div class="variablelist"><dl class="variablelist"><dt id="-t"><span class="term"><code class="option">-t</code>, </span><span class="term"><code class="option">--timeout=<em class="replaceable"><code>SECONDS</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-t"></a></dt><dd><p>Maximum number of seconds to wait for the event
queue to become empty. The default value is 120 seconds. A
value of 0 will check if the queue is empty and always
return immediately.</p></dd><dt id="-E"><span class="term"><code class="option">-E</code>, </span><span class="term"><code class="option">--exit-if-exists=<em class="replaceable"><code>FILE</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-E"></a></dt><dd><p>Stop waiting if file exists.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div></div><div class="refsect2"><a name="idm139843303506144"></a><h3 id="udevadm control command">udevadm control <em class="replaceable"><code>command</code></em><a class="headerlink" title="Permalink to this headline" href="#udevadm%20control%20command"></a></h3><p>Modify the internal state of the running udev daemon.</p><div class="variablelist"><dl class="variablelist"><dt id="-x"><span class="term"><code class="option">-x</code>, </span><span class="term"><code class="option">--exit</code></span><a class="headerlink" title="Permalink to this term" href="#-x"></a></dt><dd><p>Signal and wait for systemd-udevd to exit.</p></dd><dt id="-l"><span class="term"><code class="option">-l</code>, </span><span class="term"><code class="option">--log-priority=<em class="replaceable"><code>value</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-l"></a></dt><dd><p>Set the internal log level of
<code class="filename">systemd-udevd</code>. Valid values are the
numerical syslog priorities or their textual
representations: <code class="option">emerg</code>,
<code class="option">alert</code>, <code class="option">crit</code>,
<code class="option">err</code>, <code class="option">warning</code>,
<code class="option">notice</code>, <code class="option">info</code>, and
<code class="option">debug</code>.</p></dd><dt id="-s"><span class="term"><code class="option">-s</code>, </span><span class="term"><code class="option">--stop-exec-queue</code></span><a class="headerlink" title="Permalink to this term" href="#-s"></a></dt><dd><p>Signal systemd-udevd to stop executing new events. Incoming events
will be queued.</p></dd><dt id="-S"><span class="term"><code class="option">-S</code>, </span><span class="term"><code class="option">--start-exec-queue</code></span><a class="headerlink" title="Permalink to this term" href="#-S"></a></dt><dd><p>Signal systemd-udevd to enable the execution of events.</p></dd><dt id="-R"><span class="term"><code class="option">-R</code>, </span><span class="term"><code class="option">--reload</code></span><a class="headerlink" title="Permalink to this term" href="#-R"></a></dt><dd><p>Signal systemd-udevd to reload the rules files and other databases like the kernel
module index. Reloading rules and databases does not apply any changes to already
existing devices; the new configuration will only be applied to new events.</p></dd><dt id="-p"><span class="term"><code class="option">-p</code>, </span><span class="term"><code class="option">--property=<em class="replaceable"><code>KEY</code></em>=<em class="replaceable"><code>value</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-p"></a></dt><dd><p>Set a global property for all events.</p></dd><dt id="-m"><span class="term"><code class="option">-m</code>, </span><span class="term"><code class="option">--children-max=</code><em class="replaceable"><code>value</code></em></span><a class="headerlink" title="Permalink to this term" href="#-m"></a></dt><dd><p>Set the maximum number of events, systemd-udevd will handle at the
same time.</p></dd><dt id="--timeout=seconds"><span class="term"><code class="option">--timeout=</code><em class="replaceable"><code>seconds</code></em></span><a class="headerlink" title="Permalink to this term" href="#--timeout=seconds"></a></dt><dd><p>The maximum number of seconds to wait for a reply from systemd-udevd.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div></div><div class="refsect2"><a name="idm139843303479664"></a><h3 id="udevadm monitor
[options]
">udevadm monitor
[<em class="replaceable"><code>options</code></em>]
<a class="headerlink" title="Permalink to this headline" href="#udevadm%20monitor%0A%20%20%20%20%20%20%5Boptions%5D%0A%20%20%20%20"></a></h3><p>Listens to the kernel uevents and events sent out by a udev rule
and prints the devpath of the event to the console. It can be used to analyze the
event timing, by comparing the timestamps of the kernel uevent and the udev event.
</p><div class="variablelist"><dl class="variablelist"><dt id="-k"><span class="term"><code class="option">-k</code>, </span><span class="term"><code class="option">--kernel</code></span><a class="headerlink" title="Permalink to this term" href="#-k"></a></dt><dd><p>Print the kernel uevents.</p></dd><dt id="-u"><span class="term"><code class="option">-u</code>, </span><span class="term"><code class="option">--udev</code></span><a class="headerlink" title="Permalink to this term" href="#-u"></a></dt><dd><p>Print the udev event after the rule processing.</p></dd><dt id="-p"><span class="term"><code class="option">-p</code>, </span><span class="term"><code class="option">--property</code></span><a class="headerlink" title="Permalink to this term" href="#-p"></a></dt><dd><p>Also print the properties of the event.</p></dd><dt id="-s"><span class="term"><code class="option">-s</code>, </span><span class="term"><code class="option">--subsystem-match=<em class="replaceable"><code>string[/string]</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-s"></a></dt><dd><p>Filter events by subsystem[/devtype]. Only udev events with a matching subsystem value will pass.</p></dd><dt id="-t"><span class="term"><code class="option">-t</code>, </span><span class="term"><code class="option">--tag-match=<em class="replaceable"><code>string</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-t"></a></dt><dd><p>Filter events by property. Only udev events with a given tag attached will pass.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div></div><div class="refsect2"><a name="idm139843303463312"></a><h3 id="udevadm test
[options]
[devpath]
">udevadm test
[<em class="replaceable"><code>options</code></em>]
[<em class="replaceable"><code>devpath</code></em>]
<a class="headerlink" title="Permalink to this headline" href="#udevadm%20test%0A%20%20%20%20%20%20%5Boptions%5D%0A%20%20%20%20%20%20%20%5Bdevpath%5D%0A%20%20%20%20"></a></h3><p>Simulate a udev event run for the given device, and print debug output.</p><div class="variablelist"><dl class="variablelist"><dt id="-a"><span class="term"><code class="option">-a</code>, </span><span class="term"><code class="option">--action=<em class="replaceable"><code>string</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#-a"></a></dt><dd><p>The action string.</p></dd><dt id="-N"><span class="term"><code class="option">-N</code>, </span><span class="term"><code class="option">--resolve-names=<code class="constant">early</code>|<code class="constant">late</code>|<code class="constant">never</code></code></span><a class="headerlink" title="Permalink to this term" href="#-N"></a></dt><dd><p>Specify when udevadm should resolve names of users
and groups. When set to <code class="constant">early</code> (the
default), names will be resolved when the rules are
parsed. When set to <code class="constant">late</code>, names will
be resolved for every event. When set to
<code class="constant">never</code>, names will never be resolved
and all devices will be owned by root.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div></div><div class="refsect2"><a name="idm139843303450640"></a><h3 id="udevadm test-builtin
[options]
[command]
[devpath]
">udevadm test-builtin
[<em class="replaceable"><code>options</code></em>]
[<em class="replaceable"><code>command</code></em>]
[<em class="replaceable"><code>devpath</code></em>]
<a class="headerlink" title="Permalink to this headline" href="#udevadm%20test-builtin%0A%20%20%20%20%20%20%5Boptions%5D%0A%20%20%20%20%20%20%20%5Bcommand%5D%0A%20%20%20%20%20%20%20%5Bdevpath%5D%0A%20%20%20%20"></a></h3><p>Run a built-in command <em class="replaceable"><code>COMMAND</code></em>
for device <em class="replaceable"><code>DEVPATH</code></em>, and print debug
output.</p><div class="variablelist"><dl class="variablelist"><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h"></a></dt><dd><p>Print help text.</p></dd></dl></div></div></div><div class="refsect1"><a name="idm139843303443184"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also"></a></h2><p><a href="udev.html"><span class="citerefentry"><span class="refentrytitle">udev</span>(7)</span></a>,
<a href="systemd-udevd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-udevd.service</span>(8)</span></a></p></div></div></body></html>
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