Why sysadmin skills manage production servers in Linux CLI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the current logged-in users on a Linux server.

Linux CLI

who [1]

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

A-u

B-l

C-a

D-r

Attempts:

3 left

💡 Hint

Common Mistakes

Using -a shows all information but is verbose.

Using -l shows login processes, not users.

Using -r shows runlevel, not users.

The who -u command shows the current logged-in users along with their idle time.

2fill in blank

medium

Complete the command to check disk usage in human-readable format.

Linux CLI

df [1]

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

A-l

B-a

C-h

D-t

Attempts:

3 left

💡 Hint

Common Mistakes

Using -a shows all filesystems including dummy ones.

Using -l limits output to local filesystems only.

Using -t filters by filesystem type.

The df -h command shows disk usage with sizes in KB, MB, or GB for easy reading.

3fill in blank

hard

Fix the error in the command to restart the Apache web server using systemctl.

Linux CLI

sudo systemctl [1] apache2

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

Arestart

Benable

Cstatus

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using start only starts the service if stopped.

Using enable sets service to start on boot but doesn't restart.

Using status only shows service status.

To restart the Apache server, use systemctl restart apache2.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each word to its length if length is greater than 3.

Linux CLI

{word: [1] for word in words if [2]

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

Alen(word)

Blen(word) > 3

Cword.startswith('a')

Dword.upper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.upper() as value instead of length.

Using word.startswith('a') as condition instead of length check.

The dictionary comprehension maps each word to its length using len(word) and filters words longer than 3 characters with len(word) > 3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase keys to values only if value is positive.

Linux CLI

{ [1]: [2] for [3], [2] in data.items() if [2] > 0 }

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

Ak.upper()

Bv

Ck

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using item instead of k and v in the loop.

Not converting keys to uppercase.

The comprehension uses k.upper() as keys, v as values, and iterates over k, v in data.items(), filtering values greater than zero.