Linux dmesg command
Linux dmesg command displays the boot information.
kernel will boot information stored in the ring buffer. Your chance to view the information if the boot, you can use dmesg to view. Power information is also stored in / var / log directory, the name of dmesg file.
grammar
dmesg [-cn][-s <缓冲区大小>]
Parameter Description:
- After -c display and clear the ring buffer contents.
- -s <buffer size> is preset to 8196, exactly equal to the size of the ring buffer.
- -n setting record levels of information.
Examples
Display boot information
# 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
Display boot information
#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