dmesg for kernel messages in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to display the kernel ring buffer messages.

Linux CLI

sudo [1]

Drag options to blanks, or click blank then click option'

Admesg

Btop

Cls

Dcat

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ls' or 'cat' instead of 'dmesg'.

Forgetting to use 'sudo' when required.

The command 'dmesg' shows the kernel ring buffer messages.

2fill in blank

medium

Complete the command to show kernel messages with human-readable timestamps.

Linux CLI

sudo dmesg [1]

Drag options to blanks, or click blank then click option'

A-n

B-w

C-c

D-T

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-n' which sets the log level.

Using '-c' which clears the buffer after printing.

The '-T' option shows timestamps in human-readable format.

3fill in blank

hard

Fix the error in the command to continuously watch kernel messages.

Linux CLI

sudo dmesg [1]

Drag options to blanks, or click blank then click option'

A-T

B-n

C-w

D-c

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-c' which clears the buffer instead of watching.

Using '-n' which sets log level, not watching.

The '-w' option makes dmesg wait and print new messages as they appear.

4fill in blank

hard

Fill in the blank to filter kernel messages by log level 3 (errors only).

Linux CLI

sudo dmesg [1] 3

Drag options to blanks, or click blank then click option'

A-l

B-T

C-n

D-w

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-n' which sets the console log level but does not filter dmesg output.

Using '-w' which watches messages instead of filtering.

Using '-T' which changes timestamp format.

The '-l' option filters the output to messages of the specified log levels, like 3 for errors.

5fill in blank

hard

Fill all three blanks to clear the kernel ring buffer and then show messages.

Linux CLI

sudo dmesg [1] && sudo dmesg [2] [3]

Drag options to blanks, or click blank then click option'

A-c

B-T

C-w

D-n

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-n' instead of '-w' for watching.

Not clearing before watching.

Use '-c' to clear the buffer, then '-T' for readable timestamps and '-w' to watch new messages.