dmesg命令详解,linux dmesg命令参数选项、基本用法、高级应用,kernel会将开机
dmesg命令详解,linux dmesg命令参数选项、基本用法、高级应用,kernel会将开机
dmesg命令被用于检查和控制内核的环形缓冲区。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。开机信息保存在/var/log/dmesg
文件里。
语法
dmesg(选项)
选项
-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
[root@localhost ~]# dmesg | head Linux version 2.6.18-348.6.1.el5 (mockbuild@builder17.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-54)) #1 SMP Tue May 21 15:34:22 EDT 2013 BIOS-provided physical RAM map: BIOS-e820: 0000000000010000 - 000000000009f400 (usable) BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved) BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000007f590000 (usable) BIOS-e820: 000000007f590000 - 000000007f5e3000 (ACPI NVS) BIOS-e820: 000000007f5e3000 - 000000007f5f0000 (ACPI data) BIOS-e820: 000000007f5f0000 - 000000007f600000 (reserved) BIOS-e820: 00000000e0000000 - 00000000e8000000 (reserved)
实例基本用法
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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