From ab7d5e9134ae14f8ce01da2caedb2e23addf879f Mon Sep 17 00:00:00 2001
From: exu <mrc@frm01.net>
Date: Wed, 12 Jul 2023 19:58:43 +0200
Subject: [PATCH] Add lsusb to find USB link speed

---
 pages/04.other/useful-commands/default.en.md | 31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/pages/04.other/useful-commands/default.en.md b/pages/04.other/useful-commands/default.en.md
index 37ad47d..71bf852 100644
--- a/pages/04.other/useful-commands/default.en.md
+++ b/pages/04.other/useful-commands/default.en.md
@@ -59,3 +59,34 @@ Using `wget`, it's possible to download directories recursively from WebDAV.
 ```sh
 wget -r -nH -np --cut-dirs=1 --user={USERNAME} --password={PASSWORD} https://WEBDAVHOST/DIR/DIR
 ```
+
+### Find USB speed in use
+
+First, the USB device you want to check has to be selected
+
+[shuser]
+
+```sh
+lsusb
+Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+Bus 003 Device 003: ID 0c45:652f Microdia Backlit Gaming Keyboard
+Bus 003 Device 002: ID 046d:c084 Logitech, Inc. G203 Gaming Mouse
+Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+Bus 002 Device 002: ID 0781:55a3 SanDisk Corp.  SanDisk 3.2Gen1
+Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+Bus 001 Device 002: ID 2972:0047 FiiO Electronics Technology FiiO BTR5
+Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+```
+
+[/shuser]
+
+Now, using the ID, the USB class used can be determined
+
+[shuser]
+
+```sh
+lsusb -d 0781:55a3 -v | grep bcdUSB
+bcdUSB               3.20
+```
+
+[/shuser]