Linux dmesg命令

更新时间: 2019-10-16 12:40

Linux dmesg命令用于显示开机信息。

kernel会将开机信息存储在ring buffer中。您若是开机时来不及查看信息,可利用dmesg来查看。开机信息亦保存在/var/log目录中,名称为dmesg的文件里。

语法

dmesg [-cn][-s <缓冲区大小>]

参数说明

  • -c  显示信息后,清除ring buffer中的内容。
  • -s<缓冲区大小>  预设置为8196,刚好等于ring buffer的大小。
  • -n  设置记录信息的层级。

实例

显示开机信息

# dmesg |less
WARNING: terminal is not fully functional
[  0.000000] Initializing cgroup subsys cpuset
[  0.000000] Initializing cgroup subsys cpu
[  0.000000] Linux version 2.6.32-21-generic (buildd@ rothera) (gcc version 4.4.3 (Ub
untu 4.4.3-4ubuntu5) ) #32-Ubuntu SMP Fri Apr 16 08:10:02 UTC 2010 (Ubuntu 2.6.32-21.3
2-generic 2.6.32.11+drm33.2)
[  0.000000] KERNEL supported cpus:
[  0.000000]  Intel GenuineIntel
[  0.000000]  AMD AuthenticAMD
[  0.000000]  NSC Geode by NSC
[  0.000000]  Cyrix CyrixInstead
[  0.000000]  Centaur CentaurHauls
[  0.000000]  Transmeta GenuineTMx86
[  0.000000]  Transmeta TransmetaCPU
[  0.000000]  UMC UMC UMC UMC
[  0.000000] BIOS-provided physical RAM map:
[  0.000000] BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
[  0.000000] BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
[  0.000000] BIOS-e820: 00000000000ca000 - 00000000000cc000 (reserved)
[  0.000000] BIOS-e820: 00000000000dc000 - 00000000000e0000 (reserved)
[  0.000000] BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
[  0.000000] BIOS-e820: 0000000000100000 - 000000003fef0000 (usable)
[  0.000000] BIOS-e820: 000000003fef0000 - 000000003feff000 (ACPI data)
[  0.000000] BIOS-e820: 000000003feff000 - 000000003ff00000 (ACPI NVS)

……省略部分内容

显示开机信息

#pwd   //查看当前所在目录
/home/hnlinux/
# dmesg > boot.msg //将开机信息保存到 boot.msg文件中
#ls //显示当前目录文件
boot.msg
Where Wizards Stay Up Late

Where Wizards Stay Up Late

Katie Hafner / Simon & Schuster / 1998-1-21 / USD 16.00

Twenty five years ago, it didn't exist. Today, twenty million people worldwide are surfing the Net. "Where Wizards Stay Up Late" is the exciting story of the pioneers responsible for creating the most......一起来看看 《Where Wizards Stay Up Late》 这本书的介绍吧!

MD5 加密

MD5 加密

MD5 加密工具

HEX CMYK 转换工具

HEX CMYK 转换工具

HEX CMYK 互转工具

HSV CMYK 转换工具

HSV CMYK 转换工具

HSV CMYK互换工具