Linux dmesg命令
Linux 教程
· 2019-02-17 08:44:37
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
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