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                # Linux dmesg命令 Linux dmesg命令用于顯示開機信息。 kernel會將開機信息存儲在ring buffer中。您若是開機時來不及查看信息,可利用dmesg來查看。開機信息亦保存在/var/log目錄中,名稱為dmesg的文件里。 ### 語法 ``` dmesg [-cn][-s <緩沖區大小>] ``` **參數說明**: * -c  顯示信息后,清除ring buffer中的內容。 * -s&lt;緩沖區大小&gt;  預設置為8196,剛好等于ring buffer的大小。 * -n  設置記錄信息的層級。 ### 實例 顯示開機信息 ``` # 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) ……省略部分內容 ``` 顯示開機信息 ``` #pwd //查看當前所在目錄 /home/hnlinux/ # dmesg > boot.msg //將開機信息保存到 boot.msg文件中 #ls //顯示當前目錄文件 boot.msg ```
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