Back to the article

dmesg — kernel messages: OOM, disk and filesystem errors, segfaults

cheat sheet · util-linux 2.39 · Linux 6.8 · Ubuntu 24.04 https://lab.dimsanych.ru/en/wiki/dmesg/

Cheat sheet

sudo dmesg -T | tail -20 latest messages, with time
sudo dmesg -l err,crit errors only
sudo dmesg -x | tail with the level of each line
sudo dmesg --since '-10min' the last 10 minutes
sudo dmesg -W wait for new messages
sudo journalctl -k -b -p err kernel errors of this boot
sudo journalctl -k -b -1 the kernel of the previous boot
sudo dmesg -T | grep -iE 'oom|error|segfault'

Options

The main options are in the table below; the full list is dmesg --help.