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Linux dmesg Command

Linux Command Manual

The Linux dmesg (full name: display message) command is used to display boot messages.

The kernel stores boot messages in a ring buffer. If you missed viewing the messages at boot time, you can use dmesg to view them. Boot messages are also saved in the /var/log directory, in a file named dmesg.

Syntax

dmesg [-cn][-s <buffer size>]

Parameter Description:

Example

Display boot messages

# 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 (Ubuntu 4.4.3-4ubuntu5) ) #32-Ubuntu SMP Fri Apr 16 08:10:02 UTC 2010 (Ubuntu 2.6.32-21.32-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)

... (omitting some content)

Display boot messages

# pwd   // View the current directory
/home/hnlinux/
# dmesg > boot.msg // Save boot messages to the boot.msg file
# ls // Display files in the current directory
boot.msg

Linux Command Manual

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