Linux security fundamentals in Cybersecurity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the current user in Linux.

Cybersecurity

echo [1]

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

A$USER

B$HOME

C$SHELL

D$PATH

Attempts:

3 left

💡 Hint

Common Mistakes

Using $HOME which points to the user's home directory.

Using $PATH which lists executable search paths.

The $USER environment variable holds the name of the current logged-in user.

2fill in blank

medium

Complete the command to change file permissions to read, write, and execute for the owner only.

Cybersecurity

chmod [1] filename

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

A700

B777

C755

D644

Attempts:

3 left

💡 Hint

Common Mistakes

Using 777 which gives all permissions to everyone.

Using 644 which does not allow execute permission.

The permission 700 means read, write, and execute for the owner only, and no permissions for group or others.

3fill in blank

hard

Fix the error in the command to list all files including hidden ones.

Cybersecurity

ls [1]

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

A-r

B-l

C-h

D-a

Attempts:

3 left

💡 Hint

Common Mistakes

Using -l which lists files in long format but does not show hidden files.

Using -h which shows sizes in human-readable format.

The -a option shows all files including hidden files (those starting with a dot).

4fill in blank

hard

Fill both blanks to create a user and set a password in Linux.

Cybersecurity

[1] newuser && [2] newuser

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

Aadduser

Bpasswd

Cuserdel

Dusermod

Attempts:

3 left

💡 Hint

Common Mistakes

Using userdel which deletes a user.

Using usermod which modifies user properties but does not create.

adduser creates a new user, and passwd sets the password for that user.

5fill in blank

hard

Fill all three blanks to create a dictionary of users and their home directories, filtering only users with home starting with '/home'.

Cybersecurity

users = [1]: [2] for [3] in open('/etc/passwd') if [2].startswith('/home')}}

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

Aline.split(':')[0]

Bline.split(':')[5]

Cline

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong field indexes for username or home directory.

Not filtering lines correctly.

This comprehension extracts the username (field 0) and home directory (field 5) from each line in /etc/passwd, filtering lines where the home directory starts with '/home'.