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                        <h1 id="lsof8"><a class="header" href="#lsof8">lsof(8)</a></h1>
<pre><code class="language-markdown">lsof
  -r &lt;s&gt; ..... repeatedly execute command ervery &lt;s&gt; seconds
  -a ......... AND slection filters instead ORing (OR: default)
  -p &lt;pid&gt; ... filter by &lt;pid&gt;
  +fg ........ show file flags for file descripros
  -n ......... don't convert network addr to hostnames
  -P ......... don't convert network port to service names
  -i &lt;@h[:p]&gt;. show connections to h (hostname|ip addr) with optional port p
  -s &lt;p:s&gt; ... in conjunction with '-i' filter for protocol &lt;p&gt; in state &lt;s&gt;
  -U ......... show unix domain sockets ('@' indicates abstract sock name, see unix(7))
</code></pre>
<pre><code class="language-markdown">file flags:
  R/W/RW ..... read/write/read-write
  CR ......... create
  AP ......... append
  TR ......... truncate
</code></pre>
<pre><code class="language-markdown">-s protocols
  TCP, UDP

-s states (TCP)
  CLOSED, IDLE, BOUND, LISTEN, ESTABLISHED, SYN_SENT, SYN_RCDV, ESTABLISHED,
  CLOSE_WAIT, FIN_WAIT1, CLOSING, LAST_ACK, FIN_WAIT_2, TIME_WAIT

-s states (UDP)
  Unbound, Idle
</code></pre>
<h1 id="examples"><a class="header" href="#examples">Examples</a></h1>
<h2 id="file-flags"><a class="header" href="#file-flags">File flags</a></h2>
<p>Show open files with file flags for process:</p>
<pre><code class="language-markdown">lsof +fg -p &lt;pid&gt;
</code></pre>
<h2 id="open-tcp-connections"><a class="header" href="#open-tcp-connections">Open TCP connections</a></h2>
<p>Show open tcp connections for <code>$USER</code>:</p>
<pre><code class="language-markdown">lsof -a -u $USER -i TCP
</code></pre>
<p><strong>Note</strong>: <code>-a</code> <em>ands</em> the results. If <code>-a</code> is not given all open files matching
<code>$USER</code> and all tcp connections are listed (<em>ored</em>).</p>
<h2 id="open-connection-to-specific-host"><a class="header" href="#open-connection-to-specific-host">Open connection to specific host</a></h2>
<p>Show open connections to <code>localhost</code> for <code>$USER</code>:</p>
<pre><code class="language-markdown">lsof -a -u $USER -i @localhost
</code></pre>
<h2 id="open-connection-to-specific-port"><a class="header" href="#open-connection-to-specific-port">Open connection to specific port</a></h2>
<p>Show open connections to port <code>:1234</code> for <code>$USER</code>:</p>
<pre><code class="language-markdown">lsof -a -u $USER -i :1234
</code></pre>
<h2 id="ipv4-tcp-connections-in-established-state"><a class="header" href="#ipv4-tcp-connections-in-established-state">IPv4 TCP connections in <code>ESTABLISHED</code> state</a></h2>
<pre><code class="language-markdown">lsof -i 4TCP -s TCP:ESTABLISHED
</code></pre>
<h2 id="list-open-files-in-a-mounted-directory"><a class="header" href="#list-open-files-in-a-mounted-directory">List open files in a mounted directory.</a></h2>
<p>This may help to find which processes keep devices busy when trying to unmount
and the device is currently busy.</p>
<pre><code class="language-markdown"># Assuming /proc is a mount point.
lsof /proc
</code></pre>

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                        <h1 id="lsof8"><a class="header" href="#lsof8">lsof(8)</a></h1>
<pre><code class="language-markdown">lsof
  -r &lt;s&gt; ..... repeatedly execute command ervery &lt;s&gt; seconds
  -a ......... AND slection filters instead ORing (OR: default)
  -p &lt;pid&gt; ... filter by &lt;pid&gt;
  +fg ........ show file flags for file descripros
  -n ......... don't convert network addr to hostnames
  -P ......... don't convert network port to service names
  -i &lt;@h[:p]&gt;. show connections to h (hostname|ip addr) with optional port p
  -s &lt;p:s&gt; ... in conjunction with '-i' filter for protocol &lt;p&gt; in state &lt;s&gt;
  -U ......... show unix domain sockets ('@' indicates abstract sock name, see unix(7))
</code></pre>
<pre><code class="language-markdown">file flags:
  R/W/RW ..... read/write/read-write
  CR ......... create
  AP ......... append
  TR ......... truncate
</code></pre>
<pre><code class="language-markdown">-s protocols
  TCP, UDP

-s states (TCP)
  CLOSED, IDLE, BOUND, LISTEN, ESTABLISHED, SYN_SENT, SYN_RCDV, ESTABLISHED,
  CLOSE_WAIT, FIN_WAIT1, CLOSING, LAST_ACK, FIN_WAIT_2, TIME_WAIT

-s states (UDP)
  Unbound, Idle
</code></pre>
<h1 id="examples"><a class="header" href="#examples">Examples</a></h1>
<h2 id="file-flags"><a class="header" href="#file-flags">File flags</a></h2>
<p>Show open files with file flags for process:</p>
<pre><code class="language-markdown">lsof +fg -p &lt;pid&gt;
</code></pre>
<h2 id="open-tcp-connections"><a class="header" href="#open-tcp-connections">Open TCP connections</a></h2>
<p>Show open tcp connections for <code>$USER</code>:</p>
<pre><code class="language-markdown">lsof -a -u $USER -i TCP
</code></pre>
<p><strong>Note</strong>: <code>-a</code> <em>ands</em> the results. If <code>-a</code> is not given all open files matching
<code>$USER</code> and all tcp connections are listed (<em>ored</em>).</p>
<h2 id="open-connection-to-specific-host"><a class="header" href="#open-connection-to-specific-host">Open connection to specific host</a></h2>
<p>Show open connections to <code>localhost</code> for <code>$USER</code>:</p>
<pre><code class="language-markdown">lsof -a -u $USER -i @localhost
</code></pre>
<h2 id="open-connection-to-specific-port"><a class="header" href="#open-connection-to-specific-port">Open connection to specific port</a></h2>
<p>Show open connections to port <code>:1234</code> for <code>$USER</code>:</p>
<pre><code class="language-markdown">lsof -a -u $USER -i :1234
</code></pre>
<h2 id="ipv4-tcp-connections-in-established-state"><a class="header" href="#ipv4-tcp-connections-in-established-state">IPv4 TCP connections in <code>ESTABLISHED</code> state</a></h2>
<pre><code class="language-markdown">lsof -i 4TCP -s TCP:ESTABLISHED
</code></pre>
<h2 id="list-open-files-in-a-mounted-directory"><a class="header" href="#list-open-files-in-a-mounted-directory">List open files in a mounted directory.</a></h2>
<p>This may help to find which processes keep devices busy when trying to unmount
and the device is currently busy.</p>
<pre><code class="language-markdown"># Assuming /proc is a mount point.
lsof /proc
</code></pre>

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