GNU/Linux Command – DMESG

dmesg – Print or Control the kernel ring buffer
Summary :
dmesg is used to examine or control the kernel ring buffer. The program helps users to print out their boot-up messages.
$ dmesg -- Print the kernel boot-up messages.  $ dmesg > boot.log -- Redirect the output to a file.  # dmesg -c -- Clear the ring buffer after printing.  # dmesg -s4096 -- Set the kernel ring buffer size.  # dmesg -n1 -- Set the level at which logging of messagesdone to the console.


  1. Action must be taken immediately
  2. Critical conditions
  3. Error conditions
  4. Warning conditions
  5. Normal but significant condition
  6. Informational
  7. Debug-level messages
  8. All

Read: man dmesg

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