harmony 鸿蒙dmesg

dmesg

This command is used to display system boot and running information.

dmesg

dmesg [-c/-C/-D/-E/-L/-U]

dmesg -s [size]

dmesg -l [level]

dmesg > [fileA]

Table 1 Parameter description

Parameter	Description	Value Range
-c	Prints content in the buffer and clears the buffer.	N/A
-C	Clears the buffer.	N/A
-D/-E	Disables or enables printing to the console.	N/A
-L/-U	Disables or enables printing via the serial port.	N/A
-s size	Sets the size of the buffer. size specifies the buffer size to set.	N/A
-l level	Sets the buffering level.	[0, 5]
> fileA	Writes the content in the buffer to a file.	N/A

This command can be used only after LOSCFG_SHELL_DMESG is enabled. To enable LOSCFG_SHELL_DMESG, run the make menuconfig command in kernel/liteos_a. In the displayed dialog box, locate the Debug option and set Enable Shell dmesg to Yes. Debug —> Enable a Debug Version —> Enable Shell —> Enable Shell dmesg
If no parameter is specified, all content in the buffer is printed.
The parameters followed by hyphens (-) are mutually exclusive.
1. Before writing content to a file, ensure that the file system has been mounted.
2. Disabling the serial port printing will adversely affect shell. You are advised to set up a connection using Telnet before disabling the serial port.

Run dmesg> dmesg.log.

Write the content in the buffer to the dmesg.log file.

OHOS # dmesg > dmesg.log
Dmesg write log to dmesg.log success

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