dmesg命令详解

dmesg 命令的使⽤范例

大陆漂移说

下⾯我们展⽰⼀些最负盛名的‘dmesg’命令⼯具以及其实际使⽤举例。‘dmesg’命令的使⽤语法如下。

刑法236 2371. 列出加载到内核中的所有驱动

grep’⽂字处理⼯具来处理‘dmesg’命令的输出。由于dmesg⽇志的输出不适合在⼀页中完全显⽰，因此我们使⽤管道（pipe）将其输出送到more或者less命令单页显⽰。

root@tecmintcom dmesg more

root@tecmintcom dmesg less

1. ]Initializing ]Initializing ]Initializing ]Linux3.11013generic()(4.81(/ .-))#20-Ubuntu SMP Wed Oct 23 17:26:33 UTC 2013

2. Ubuntu

3.11013.20generic3.116 ]:

3. ]IntelGenuineIntel

4. ]AuthenticAMD

九章律5. ]Geodeby ]CyrixCyrixInstead

6. ]CentaurCentaurHauls

7. ]TransmetaGenuineTMx86

8. ]TransmetaTransmetaCPU

9. ] ]:-:

10. ]-:[0x00000000000000000x000000000009fbff usable

2-氯-5-甲基吡啶

11. ]-:[0x00000000000f00000x00000000000fffff reserved

12. ]-:[0x00000000001000000x000000007dc08bff usable

13. ]-:[0x000000007dc08c000x000000007dc5cbff ACPI NVS

湖南大学综合管理系统

14. ]-:[0x000000007dc5cc000x000000007dc5ebff ACPI data

15. ]-:[0x000000007dc5ec000x000000007fffffff reserved

16. ]-:[0x00000000e00000000x00000000efffffff reserved

17. ]-:[0x00000000fec000000x00000000fed003ff reserved

18. ]-:[0x00000000fed200000x00000000fed9ffff reserved

19. ]-:[0x00000000fee000000x00000000feefffff reserved

20. ]-:[0x00000000ffb000000x00000000ffffffff reserved

21. ]( ):2. 列出所有被检测到的硬件

1. root@tecmintcom dmesg grep sda

2. ]2000 sda - logical blocks 250/ )

3. ]2000 sda off

4. ]2000 sda :003a0000

5. ]2000 sda cache enabled read cache enabled doesn注解 ‘sda’表⽰第⼀块 SATA硬盘，‘sdb’表⽰第⼆块SATA硬盘。若想查看

IDE硬盘搜索‘hda’或‘hdb’关键词。

在‘dmesg’命令后跟随‘head’命令来显⽰开始⼏⾏，‘dmesg | head -20′命令将显⽰开始的前20⾏。

6. root@tecmintcom dmesg head 20

7. ]Initializing ]Initializing ]Initializing ]Linux3.11013generic()(4.81(/ .-))#20-Ubuntu SMP Wed Oct 23 17:26:33 UTC 2013 (Ubuntu

3.11.0-13.20-generic 3.11.6)

8. ]:

9. ]IntelGenuineIntel

10. ]AuthenticAMD

11. ]Geodeby ]CyrixCyrixInstead

12. ]CentaurCentaurHauls

13. ]TransmetaGenuineTMx86

14. ]TransmetaTransmetaCPU

15. ] ]:-:

16. ]-:[0x00000000000000000x000000000009fbff usable

17. ]-:[0x00000000000f00000x00000000000fffff reserved

18. ]-:[0x00000000001000000x000000007dc08bff usable

19. ]-:[0x000000007dc08c000x000000007dc5cbff ACPI NVS

20. ]-:[0x000000007dc5cc000x000000007dc5ebff ACPI data

21. ]-:[0x000000007dc5ec000x000000007fffffff reserved

在‘dmesg’命令后跟随‘tail’命令（‘ dmesg | tail -20’）来输出‘dmesg’命令的最后20⾏⽇志，当你插⼊可移动设备时它是⾮常有⽤的。

root@tecmintcom dmesg tail 20

:-0x378 irq PCSPPTRISTATE:--():with swap on devsda2 :- extents1:--::()20002006NetfilterCoreTeam

0.50( buckets max:Registered10

:DisabledPrivacyExtensions

:LinkisUp1000MbpsFullDuplex :None

work thread pool up

work thread pool -:Loaded

:Loaded

:Security:-:noIPv6= audit1398268784.59318630 audit_enabled0= auid4294967295= res1

-:-:-:5. 搜索包含特定字符串的被检测到的硬件

1. root@tecmintcom log dmesg grep i usb

2. root@tecmintcom log dmesg grep i dma

撒玛利亚人3. root@tecmintcom log dmesg grep i tty

4. root@tecmintcom log dmesg grep i memory

1. ]Scanning1for ]:[0x000000000x01ffffff ]Base[]9b00016384

2. ]:[0x000000000x000fffff ]:[0x378000000x379fffff ]:[0x340000000x377fffff ]:[0x001000000x33ffffff ]:[0x37a000000x37bfdfff ]Early

]:Registered:[0x0009f0000x000effff ]:Registered:[0x000f00000x000fffff ]try'cgroup_disable=memory'if't want memory cgroups

3. 6. 清空dmesg缓冲区⽇志

1. root@tecmintcom log dmesg c

在某些发⾏版中可以使⽤命令‘tail -f /var/log/dmesg’来实时监控dmesg的⽇志输出。

root@tecmintcom log watch 结论：dmesg命令在系统dmesg记录实时更改或产⽣的情况下是⾮常有⽤的。你可以使⽤man dmesg来获取更多关于dmesg的信息。

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