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doc: update command/dmesg.md (#517)

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Qliangw 2023-06-19 18:07:33 +08:00 committed by GitHub
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@ -50,4 +50,12 @@ dmesg | grep sda
[ 2.448503] sd 0:0:0:0: [sda] Attached SCSI disk [ 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
```