Comandos de la terminal/dmesg

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dmesg

[root@Pridd ~]# dmesg --help

Usage:
 dmesg [options]

Options:
 -C, --clear                 clear the kernel ring buffer
 -c, --read-clear            read and clear all messages
 -D, --console-off           disable printing messages to console
 -E, --console-on            enable printing messages to console
 -F, --file <file>           use the file instead of the kernel log buffer
 -f, --facility <list>       restrict output to defined facilities
 -H, --human                 human readable output
 -k, --kernel                display kernel messages
 -L, --color[=<when>]        colorize messages (auto, always or never)
 -l, --level <list>          restrict output to defined levels
 -n, --console-level <level> set level of messages printed to console
 -P, --nopager               do not pipe output into a pager
 -r, --raw                   print the raw message buffer
 -S, --syslog                force to use syslog(2) rather than /dev/kmsg
 -s, --buffer-size <size>    buffer size to query the kernel ring buffer
 -u, --userspace             display userspace messages
 -w, --follow                wait for new messages
 -x, --decode                decode facility and level to readable string
 -d, --show-delta            show time delta between printed messages
 -e, --reltime               show local time and time delta in readable format
 -T, --ctime                 show human readable timestamp
 -t, --notime                don't print messages timestamp
     --time-format <format>  show time stamp using format:
                               [delta|reltime|ctime|notime|iso]
Suspending/resume will make ctime and iso timestamps inaccurate.

 -h, --help     display this help and exit
 -V, --version  output version information and exit

Supported log facilities:
    kern - kernel messages
    user - random user-level messages
    mail - mail system
  daemon - system daemons
    auth - security/authorization messages
  syslog - messages generated internally by syslogd
     lpr - line printer subsystem
    news - network news subsystem

Supported log levels (priorities):
   emerg - system is unusable
   alert - action must be taken immediately
    crit - critical conditions
     err - error conditions
    warn - warning conditions
  notice - normal but significant condition
    info - informational
   debug - debug-level messages


For more details see dmesg(1).

[root@Pridd ~]# dmesg --version
dmesg from util-linux 2.24

[root@Pridd ~]# dmesg
 .
 .
 .
[35060.001448] Adding 4087700k swap on /dev/sda2.  Priority:100 extents:1 across:4087700k FS
[35105.721309] Adding 499996k swap on /mnt/MiSwapfile.  Priority:50 extents:1 across:499996k FS
[35125.778044] Adding 2097148k swap on /mnt/swapfile.  Priority:500 extents:6 across:2392060k FS
[35657.983304] Adding 4087700k swap on /dev/sda2.  Priority:-1 extents:1 across:4087700k FS
[35687.522292] Adding 4087700k swap on /dev/sda2.  Priority:100 extents:1 across:4087700k FS

[root@Pridd ~]# dmesg --reltime
 .
 .
 .
[Aug16 04:33] Adding 4087700k swap on /dev/sda2.  Priority:100 extents:1 across:4087700k FS
[Aug16 04:34] Adding 499996k swap on /mnt/MiSwapfile.  Priority:50 extents:1 across:499996k FS
[ +20.056735] Adding 2097148k swap on /mnt/swapfile.  Priority:500 extents:6 across:2392060k FS
[Aug16 04:43] Adding 4087700k swap on /dev/sda2.  Priority:-1 extents:1 across:4087700k FS
[Aug16 04:44] Adding 4087700k swap on /dev/sda2.  Priority:100 extents:1 across:4087700k FS
[Aug16 05:02] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[  +0.010389] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.

[rrc@Pridd ~]$ dmesg -f lpr

[rrc@Pridd ~]$ dmesg -f auth

[rrc@Pridd ~]$ dmesg -f mail

[rrc@Pridd ~]$ dmesg -f daemon
[    1.809026] dracut: dracut-034
[    1.891473] systemd-udevd[193]: starting version 208
[    2.836379] dracut: Starting plymouth daemon
 .
 .
 .
[    6.903736] systemd[1]: Starting Journal Service...
[    6.904368] systemd[1]: Started Journal Service.
[    6.973581] systemd-readahead[451]: Bumped block_nr parameter of 8:0 to 20480. This is a temporary hack and should be removed one day.
[    8.148602] systemd-udevd[512]: starting version 208
[    8.619331] systemd-udevd[521]: renamed network interface eth0 to enp3s0
[    8.712155] systemd-udevd[524]: renamed network interface wlan0 to wlp2s0

[rrc@Pridd ~]$ dmesg -ef kern
 .
 .
 .
[Aug16 05:12] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[  +0.011434] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[Aug16 05:13] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[  +0.011420] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[  +2.464155] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[  +0.011457] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.

[rrc@Pridd ~]$ dmesg -ek

[rrc@Pridd ~]$ dmesg -ef user

[rrc@Pridd ~]$ dmesg -ef syslog
[Aug15 18:49] systemd-journald[455]: Received request to flush runtime journal from PID 1

[rrc@Pridd ~]$ dmesg -el emerg

[rrc@Pridd ~]$ dmesg -el alert

[rrc@Pridd ~]$ dmesg -el crit

[rrc@Pridd ~]$ dmesg -el err
[Aug16 03:54] sd 6:0:0:0: [sdb] No Caching mode page found
[  +0.000004] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[  +0.003267] sd 6:0:0:0: [sdb] No Caching mode page found
[  +0.000008] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[  +1.783254] sd 6:0:0:0: [sdb] No Caching mode page found
[  +0.000008] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[Aug16 03:57] sd 6:0:0:0: [sdb] No Caching mode page found
[  +0.000006] sd 6:0:0:0: [sdb] Assuming drive cache: write through

[rrc@Pridd ~]$ dmesg -el warn
 .
 .
 .
[Aug16 05:08] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[Aug16 05:12] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[Aug16 05:13] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[  +2.475575] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[Aug16 05:18] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6
[Aug16 05:19] psmouse serio4: Touchpad at isa0060/serio4/input0 lost sync at byte 6

[rrc@Pridd ~]$ dmesg -el notice
 .
 .
 .
[Aug16 05:12] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[Aug16 05:13] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[  +2.475612] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[Aug16 05:18] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[Aug16 05:19] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.
[Aug16 05:22] psmouse serio4: Touchpad at isa0060/serio4/input0 - driver resynced.

[rrc@Pridd ~]$ dmesg -el info
 .
 .
 .
[Aug16 04:33] Adding 4087700k swap on /dev/sda2.  Priority:100 extents:1 across:4087700k FS
[Aug16 04:34] Adding 499996k swap on /mnt/MiSwapfile.  Priority:50 extents:1 across:499996k FS
[ +20.056735] Adding 2097148k swap on /mnt/swapfile.  Priority:500 extents:6 across:2392060k FS
[Aug16 04:43] Adding 4087700k swap on /dev/sda2.  Priority:-1 extents:1 across:4087700k FS
[Aug16 04:44] Adding 4087700k swap on /dev/sda2.  Priority:100 extents:1 across:4087700k FS

[rrc@Pridd ~]$ dmesg -el debug
 .
 .
 .
[  +0.000002] PM: Looking for hibernation image.
[  +0.002087] PM: Image not found (code -22)
[  +0.000003] PM: Hibernation image not present or could not be loaded.
[  +4.108699] snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X
[  +0.093792] ath: EEPROM regdomain: 0x60
[  +0.000001] ath: EEPROM indicates we should expect a direct regpair map
[  +0.000002] ath: Country alpha2 being used: 00
[  +0.000001] ath: Regpair used: 0x60
[  +0.003824] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[Aug15 18:50] atl1c 0000:03:00.0: irq 44 for MSI/MSI-X
[Aug16 03:54] sd 6:0:0:0: [sdb] Mode Sense: 23 00 00 00

[rrc@Pridd ~]$ dmesg -eHl debug

[rrc@Pridd ~]$ dmesg -eL auto -l debug
 .
 .
 .
[  +0.020073] PM: Basic memory bitmaps freed
[  +0.002976] PM: Hibernation image partition 8:2 present
[  +0.000002] PM: Looking for hibernation image.
[  +0.002087] PM: Image not found (code -22)
[  +0.000003] PM: Hibernation image not present or could not be loaded.
[  +4.108699] snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X
[  +0.093792] ath: EEPROM regdomain: 0x60
[  +0.000001] ath: EEPROM indicates we should expect a direct regpair map
[  +0.000002] ath: Country alpha2 being used: 00
[  +0.000001] ath: Regpair used: 0x60
[  +0.003824] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[Aug15 18:50] atl1c 0000:03:00.0: irq 44 for MSI/MSI-X
[Aug16 03:54] sd 6:0:0:0: [sdb] Mode Sense: 23 00 00 00

[rrc@Pridd ~]$ dmesg -eL auto -u
 .
 .
 .
[  +0.000632] systemd[1]: Started Journal Service.
[  +0.069213] systemd-readahead[451]: Bumped block_nr parameter of 8:0 to 20480. This is a temporary hack and should be removed one day.
[  +1.175021] systemd-udevd[512]: starting version 208
[  +0.470729] systemd-udevd[521]: renamed network interface eth0 to enp3s0
[  +0.092824] systemd-udevd[524]: renamed network interface wlan0 to wlp2s0
[  +4.718958] systemd-journald[455]: Received request to flush runtime journal from PID 1


[rrc@Pridd ~]$ dmesg -exHL auto -l err
kern  :err   : [Aug16 03:54] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [  +0.000004] sd 6:0:0:0: [sdb] Assuming drive cache: write throu
kern  :err   : [  +0.003267] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [  +0.000008] sd 6:0:0:0: [sdb] Assuming drive cache: write throu
kern  :err   : [  +1.783254] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [  +0.000008] sd 6:0:0:0: [sdb] Assuming drive cache: write throu
kern  :err   : [Aug16 03:57] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [  +0.000006] sd 6:0:0:0: [sdb] Assuming drive cache: write throu

(END)

[rrc@Pridd ~]$ dmesg -dexHL auto -l err
kern  :err   : [<    0.000000>] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [<    0.000004>] sd 6:0:0:0: [sdb] Assuming drive cache: write th
kern  :err   : [<    0.003267>] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [<    0.000008>] sd 6:0:0:0: [sdb] Assuming drive cache: write th
kern  :err   : [<    1.783254>] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [<    0.000008>] sd 6:0:0:0: [sdb] Assuming drive cache: write th
kern  :err   : [<  174.202178>] sd 6:0:0:0: [sdb] No Caching mode page found
kern  :err   : [<    0.000006>] sd 6:0:0:0: [sdb] Assuming drive cache: write th

(END)

[rrc@Pridd ~]$ dmesg -Tl err
[Sat Aug 16 03:54:31 2014] sd 6:0:0:0: [sdb] No Caching mode page found
[Sat Aug 16 03:54:31 2014] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[Sat Aug 16 03:54:31 2014] sd 6:0:0:0: [sdb] No Caching mode page found
[Sat Aug 16 03:54:31 2014] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[Sat Aug 16 03:54:33 2014] sd 6:0:0:0: [sdb] No Caching mode page found
[Sat Aug 16 03:54:33 2014] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[Sat Aug 16 03:57:27 2014] sd 6:0:0:0: [sdb] No Caching mode page found
[Sat Aug 16 03:57:27 2014] sd 6:0:0:0: [sdb] Assuming drive cache: write through

[rrc@Pridd ~]$ dmesg -tl err
sd 6:0:0:0: [sdb] No Caching mode page found
sd 6:0:0:0: [sdb] Assuming drive cache: write through
sd 6:0:0:0: [sdb] No Caching mode page found
sd 6:0:0:0: [sdb] Assuming drive cache: write through
sd 6:0:0:0: [sdb] No Caching mode page found
sd 6:0:0:0: [sdb] Assuming drive cache: write through
sd 6:0:0:0: [sdb] No Caching mode page found
sd 6:0:0:0: [sdb] Assuming drive cache: write through

[rrc@Pridd ~]$ dmesg -w

[rrc@Pridd ~]$ dmesg -wdexL auto -l err