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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
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[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
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[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
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[ 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
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[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
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[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
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[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
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[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
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[ +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
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[ +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
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[ +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
