Correlating /var/log/* timestamps

drywall_dan

/var/log/messages , /var/log/syslog , and some other log files use a timestamp which contains an absolute time, like Jan 13 14:13:10 . /var/log/Xorg.0.log and /var/log/dmesg , as well as the output of $ dmesg , use a format that looks like [50595.991610] malkovich: malkovich malkovich malkovich malkovich I'm guessing/gathering that the numbers represent seconds and microseconds since startup. However, my attempt to correlate these two sets of...

Originally asked by intuited on Stack Exchange (unix) (CC BY-SA 2.5).

uphilltech

Great question — answering as the UphillTech team:

Interesting problem, Not sure I've ever tried to do this. But I have notice the timestamp you are talking about and I have always belived it to be seconds since bootup. In my syslog I have on my server, I have: Jan 10 19:58:55 wdgitial kernel: [ 0.000000] Initializing cgroup subsys cpuset Jan 10 19:58:55 wdgitial kernel: [ 0.000000] Initializing cgroup subsys cpu Jan 10 19:58:55 wdgitial kernel: [ 0.000000] Linux version 2.6.32-21-server (buildd@yellow) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC 2010 (Ubuntu 2.6.32-21.32-server 2.6.32.11+drm33.2) Jan 10 19:58:55 wdgitial kernel: [ 0.000000] Command line: root=/dev/xvda1 ro quiet splash I would...

Full answer by Ryan Gibbons: https://unix.stackexchange.com/a/5819 (CC BY-SA 2.5).

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