dmesg命令添加应用实例
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小弟调调™
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dmesg
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dmesg
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===
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显示Linux系统启动信息
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## 补充说明
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**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。
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### 语法
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```
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dmesg(选项)
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```
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### 选项
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```
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-c：显示信息后，清除ring buffer中的内容；
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-s<缓冲区大小>：预设置为8196，刚好等于ring buffer的大小；
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-n：设置记录信息的层级。
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```
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### 实例
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```
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[root@localhost ~]# dmesg | head
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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
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BIOS-provided physical RAM map:
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BIOS-e820: 0000000000010000 - 000000000009f400 (usable)
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BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
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BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
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BIOS-e820: 0000000000100000 - 000000007f590000 (usable)
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BIOS-e820: 000000007f590000 - 000000007f5e3000 (ACPI NVS)
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BIOS-e820: 000000007f5e3000 - 000000007f5f0000 (ACPI data)
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BIOS-e820: 000000007f5f0000 - 000000007f600000 (reserved)
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BIOS-e820: 00000000e0000000 - 00000000e8000000 (reserved)
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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显示Linux系统启动信息
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## 补充说明
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**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。
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### 语法
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```
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dmesg(选项)
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```
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### 选项
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```
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-c：显示信息后，清除ring buffer中的内容；
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-s<缓冲区大小>：预设置为8196，刚好等于ring buffer的大小；
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-n：设置记录信息的层级。
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```
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### 实例
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```
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[root@localhost ~]# dmesg | head
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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
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BIOS-provided physical RAM map:
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BIOS-e820: 0000000000010000 - 000000000009f400 (usable)
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BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
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BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
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BIOS-e820: 0000000000100000 - 000000007f590000 (usable)
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BIOS-e820: 000000007f590000 - 000000007f5e3000 (ACPI NVS)
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BIOS-e820: 000000007f5e3000 - 000000007f5f0000 (ACPI data)
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BIOS-e820: 000000007f5f0000 - 000000007f600000 (reserved)
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BIOS-e820: 00000000e0000000 - 00000000e8000000 (reserved)
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```
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查看硬盘基础信息
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```bash
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dmesg | grep sda
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[ 2.442555] sd 0:0:0:0: [sda] 488281250 512-byte logical blocks: (250 GB/232 GiB)
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[ 2.442590] sd 0:0:0:0: [sda] Write Protect is off
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[ 2.442592] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
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[ 2.442607] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
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[ 2.447533] sda: sda1
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[ 2.448503] sd 0:0:0:0: [sda] Attached SCSI disk
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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