From a1549ed0c60a692ac426db19b9dd5ba11e8f8e54 Mon Sep 17 00:00:00 2001
From: Qliangw <qliangw@163.com>
Date: Mon, 19 Jun 2023 18:07:33 +0800
Subject: [PATCH] doc: update command/dmesg.md (#517)

---
 command/dmesg.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/command/dmesg.md b/command/dmesg.md
index 5e992b4f28..d1258517a5 100644
--- a/command/dmesg.md
+++ b/command/dmesg.md
@@ -50,4 +50,12 @@ dmesg | grep sda
 [    2.448503] sd 0:0:0:0: [sda] Attached SCSI disk
 ```
 
+查看多关键字
 
+```shell
+dmesg | grep -E "vcc5v0_host|vcc_3v3_s0|ttyS"
+
+[    1.193143] vcc5v0_host: supplied by vcc5v0_usb
+[    1.481139] feb80000.serial: ttyS5 at MMIO 0xfeb80000 (irq = 73, base_baud = 1500000) is a 16550A
+[    1.513541] vcc_3v3_s0: supplied by vcc5v0_sys
+```