dmesg

顯示Linux系統啓動信息

補充說明

dmesg命令 被用於檢查和控制內核的環形緩衝區。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。開機信息保存在/var/log/dmesg文件裏。

語法

1dmesg(選項)

選項

1-c:顯示信息後,清除ring buffer中的內容;
2-s<緩衝區大小>:預設置爲8196,剛好等於ring buffer的大小;
3-n:設置記錄信息的層級。

實例

 1[root@localhost ~]# dmesg | head
 2Linux version 2.6.18-348.6.1.el5 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-54)) #1 SMP Tue May 21 15:34:22 EDT 2013
 3BIOS-provided physical RAM map:
 4 BIOS-e820: 0000000000010000 - 000000000009f400 (usable)
 5 BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
 6 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 7 BIOS-e820: 0000000000100000 - 000000007f590000 (usable)
 8 BIOS-e820: 000000007f590000 - 000000007f5e3000 (ACPI NVS)
 9 BIOS-e820: 000000007f5e3000 - 000000007f5f0000 (ACPI data)
10 BIOS-e820: 000000007f5f0000 - 000000007f600000 (reserved)
11 BIOS-e820: 00000000e0000000 - 00000000e8000000 (reserved)

查看硬盤基礎信息

1dmesg | grep sda
2
3[    2.442555] sd 0:0:0:0: [sda] 488281250 512-byte logical blocks: (250 GB/232 GiB)
4[    2.442590] sd 0:0:0:0: [sda] Write Protect is off
5[    2.442592] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
6[    2.442607] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
7[    2.447533]  sda: sda1
8[    2.448503] sd 0:0:0:0: [sda] Attached SCSI disk

查看多關鍵字

1dmesg | grep -E "vcc5v0_host|vcc_3v3_s0|ttyS"
2
3[    1.193143] vcc5v0_host: supplied by vcc5v0_usb
4[    1.481139] feb80000.serial: ttyS5 at MMIO 0xfeb80000 (irq = 73, base_baud = 1500000) is a 16550A
5[    1.513541] vcc_3v3_s0: supplied by vcc5v0_sys

來源:https://github.com/jaywcjlove/linux-command

最後修改於: Wednesday, January 31, 2024

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