Linux Command: dmesg
Print or control the kernel ring buffer — hardware events, driver messages, OOM kills
Terminal — System Information
Command
$
dmesg -T --level=err,warn | tail -20
Output
[Wed Apr 22 14:23:01 2026] EXT4-fs warning: mounting fs with errors
[Wed Apr 22 14:25:43 2026] Out of memory: Killed process 4821 (node)
dmesg is your first stop for kernel-level diagnostics. -T shows human-readable timestamps, --level filters severity (err, warn, notice, info). Check here first for hardware failures, driver issues, USB problems, and OOM killer events.