dmesg命令基于缓冲区打印信息dmesg -c可以清除该内存信息清除后demsg 命令不显示任何信息,但可以到/var/log/dmesg查看信息 dmesg |tail 20dmesg |head 20dmesg |grep sdadmesg |grep ttydmesg |grep memorydmesg |grep DMAdmesg |grep usb [[email protected] var]# dmesg | more Linux version 2.6.32 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-55)) #1 SMP Sun Sep 20 18:58:21 PDT 2015 Command line: ro root=LABEL=/ rhgb quiet KERNEL supported cpus: Intel GenuineIntel AMD AuthenticAMD Centaur CentaurHauls BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009f400 (usable) BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved) BIOS-e820: 00000000000ca000 - 00000000000cc000 (reserved) BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 0000000057ee0000 (usable) BIOS-e820: 0000000057ee0000 - 0000000057eff000 (ACPI data) BIOS-e820: 0000000057eff000 - 0000000057f00000 (ACPI NVS) BIOS-e820: 0000000057f00000 - 0000000058000000 (usable) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) BIOS-e820: 00000000fffe0000 - 0000000100000000 (reserved) DMI present. Phoenix BIOS detected: BIOS may corrupt low RAM, working around it. e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved) last_pfn = 0x58000 max_arch_pfn = 0x400000000 MTRR default type: uncachable MTRR fixed ranges enabled: 00000-9FFFF write-back A0000-BFFFF uncachable C0000-CBFFF write-protect CC000-EFFFF uncachable F0000-FFFFF write-protect
[[email protected] var]# dmesg | less Linux version 2.6.32 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-55)) #1 SMP Sun Sep 20 18:58:21 PDT 2015 Command line: ro root=LABEL=/ rhgb quiet KERNEL supported cpus: Intel GenuineIntel AMD AuthenticAMD Centaur CentaurHauls BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009f400 (usable) BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved) BIOS-e820: 00000000000ca000 - 00000000000cc000 (reserved) BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 0000000057ee0000 (usable) BIOS-e820: 0000000057ee0000 - 0000000057eff000 (ACPI data) BIOS-e820: 0000000057eff000 - 0000000057f00000 (ACPI NVS) BIOS-e820: 0000000057f00000 - 0000000058000000 (usable) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) BIOS-e820: 00000000fffe0000 - 0000000100000000 (reserved) DMI present. Phoenix BIOS detected: BIOS may corrupt low RAM, working around it. e820 update range: 0000000000000000 - 0000000000010000 (usable) ==> (reserved) last_pfn = 0x58000 max_arch_pfn = 0x400000000 MTRR default type: uncachable MTRR fixed ranges enabled: 00000-9FFFF write-back A0000-BFFFF uncachable C0000-CBFFF write-protect CC000-EFFFF uncachable F0000-FFFFF write-protect
[[email protected] var]# dmesg | tail
Bluetooth: L2CAP socket layer initialized
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
eth0: no IPv6 routers present
hdc: task_pio_intr: status=0x51 { DriveReady SeekComplete Error }
hdc: task_pio_intr: error=0x04 { AbortedCommand }
hdc: possibly failed opcode: 0xec
xx[4107]: segfault at 0 ip 0000000000400454 sp 00007fff206b7d60 error 6 in xx[400000+1000]
[[email protected] var]# dmesg | grep ttyS* console [tty0] enabled serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 00:0b: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A You have new mail in /var/spool/mail/root
dmesg -c 清除缓存
tail -n 20 /var/log/dmesg
[[email protected] log]# tail -n 20 /var/log/dmesg Floppy drive(s): fd0 is 1.44M FDC 0 is a post-1991 82077 ide-cd driver 5.00 ide-cd: hdc: ATAPI 1X DVD-ROM DVD-R/RAM CD-R/RW drive, 32kB Cache Uniform CD-ROM driver Revision: 3.20 sd 0:0:0:0: Attached scsi generic sg0 type 0 lp0: using parport0 (interrupt-driven). lp0: console ready NET: Registered protocol family 10 lo: Disabled Privacy Extensions md: Autodetecting RAID arrays. md: Scanned 0 and added 0 devices. md: autorun ... md: ... autorun DONE. device-mapper: multipath: version 1.1.0 loaded EXT3 FS on sda2, internal journal kjournald starting. Commit interval 5 seconds EXT3 FS on sda1, internal journal EXT3-fs: mounted filesystem with writeback data mode. Adding 2064344k swap on /dev/sda3. Priority:-1 extents:1 across:2064344k
[[email protected] log]# tail -n 20 messages
May 28 22:42:19 localhost avahi-daemon[3921]: Server startup complete. Host name is localhost.local. Local service cookie is 982515779.
May 28 22:42:20 localhost avahi-daemon[3921]: Service "SFTP File Transfer on localhost" (/services/sftp-ssh.service) successfully established.
May 28 22:42:22 localhost smartd[4007]: smartd version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
May 28 22:42:22 localhost smartd[4007]: Home page is http://smartmontools.sourceforge.net/
May 28 22:42:22 localhost smartd[4007]: Opened configuration file /etc/smartd.conf
May 28 22:42:22 localhost smartd[4007]: Configuration file /etc/smartd.conf was parsed, found DEVICESCAN, scanning devices
May 28 22:42:22 localhost smartd[4007]: Device: /dev/hdc, opened
May 28 22:42:22 localhost smartd[4007]: Device: /dev/hdc, not ATA, no IDENTIFY DEVICE Structure
May 28 22:42:22 localhost kernel: hdc: task_pio_intr: status=0x51 { DriveReady SeekComplete Error }
May 28 22:42:22 localhost kernel: hdc: task_pio_intr: error=0x04 { AbortedCommand }
May 28 22:42:22 localhost kernel: hdc: possibly failed opcode: 0xec
May 28 22:42:22 localhost smartd[4007]: Device: /dev/sda, opened
May 28 22:42:22 localhost smartd[4007]: Device: /dev/sda, IE (SMART) not enabled, skip device Try ‘smartctl -s on /dev/sda‘ to turn on SMART features
May 28 22:42:22 localhost smartd[4007]: Monitoring 0 ATA and 0 SCSI devices
May 28 22:42:22 localhost smartd[4013]: smartd has fork()ed into background mode. New PID=4013.
May 28 22:42:25 localhost gdm[4044]: gdm_config_parse: Logdir /var/log/gdm does not exist or isn‘t a directory. Using ServAuthDir /var/gdm.
May 28 22:42:25 localhost pcscd: winscard.c:304:SCardConnect() Reader E-Gate 0 0 Not Found
May 28 22:42:25 localhost last message repeated 3 times
May 28 22:43:45 localhost kernel: xx[4107]: segfault at 0 ip 0000000000400454 sp 00007fff206b7d60 error 6 in xx[400000+1000]
May 28 22:45:06 localhost logger: Oracle Configuration Manager failed to establish a connection to Oracle. Reconfigure using /opt/oracle/112/ccr/bin/configCCR
时间： 2024-08-02 04:13:33