dmesg
Print kernel ring buffer messages for hardware and driver diagnostics.
Synopsis
dmesg [OPTION]...
Examples
dmesg | tail -30
dmesg -T
dmesg -l err,warn
sudo dmesg -wH
Common options
| Flag | Description |
|---|---|
| -H | Human-readable output with timestamps |
| -T | Print human-readable timestamps |
| -l | Filter by log level |
| -w | Follow new messages |
| --color | Colorize output |
About dmesg
The `dmesg` command print kernel ring buffer messages for hardware and driver diagnostics. System information commands provide insight into hardware, kernel, memory, disk, and user session details.
These are typically the first tools you reach for when diagnosing system problems, capacity planning, or auditing a server's configuration. They work across most Linux distributions without additional packages.
The command accepts 5 commonly used flags shown above, though the full set of options is available in the man page (`man dmesg`). The 4 examples on this page cover typical real-world usage patterns that you can copy and adapt for your own workflows.
Related commands
More System Info Commands
Other commands in the System Info category