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dmesg
===
显示Linux系统启动信息
## 说明
**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 ，
### 语法
```
```
```
： ， ；
-s<缓冲区大小>： ， ；
-n：
```
### 实例
```
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)
```
查看硬盘基础信息
```bash
dmesg | grep sda
[ 2.442555] sd 0:0:0:0: [sda] 488281250 512-byte logical blocks: (250 GB/232 GiB)
[ 2.442590] sd 0:0:0:0: [sda] Write Protect is off
[ 2.442592] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 2.442607] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2.447533] sda: sda1
[ 2.448503] sd 0:0:0:0: [sda] Attached SCSI disk
```
