sudo for elevated privileges in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this sudo command?

You run the command sudo -l as a normal user. What does this command show?

Linux CLI

sudo -l

A Lists the commands the user can run with sudo, possibly without a password

B Shows the current user's password

C Displays the system's uptime

D Starts a root shell immediately

💡 Hint

Think about what 'sudo -l' is used for in daily tasks.

The command 'sudo -l' lists the commands that the current user is allowed to run with sudo privileges, often without needing to enter a password.

💻 Command Output

intermediate

What happens when you run this sudo command?

What is the output or effect of running sudo echo 'Hello' in a terminal?

Linux CLI

sudo echo 'Hello'

A Prints 'Hello' to the terminal

B Prints an error about permission denied

C Runs echo as root but prints 'Hello' as the normal user

D Does nothing and returns to prompt silently

💡 Hint

Consider how sudo affects simple commands like echo.

The command runs echo with sudo, so it prints 'Hello' to the terminal as expected.

🔧 Debug

advanced

Why does this sudo command fail?

You try to run sudo cat /etc/shadow but get a 'Permission denied' error. What is the most likely reason?

Linux CLI

sudo cat /etc/shadow

A The cat command is not installed on the system

B The /etc/shadow file does not exist

C You need to use 'su' instead of 'sudo' to read this file

D Your user is not in the sudoers file and cannot run sudo commands

💡 Hint

Think about user permissions and sudo access.

If your user is not allowed to use sudo, running sudo commands will fail with permission errors even if the command is correct.

🧠 Conceptual

advanced

What does the sudoers file control?

Which of the following best describes the purpose of the sudoers file?

A It stores encrypted passwords for all users

B It defines which users can run which commands with sudo privileges

C It logs all sudo command executions

D It contains system-wide environment variables

💡 Hint

Think about how sudo controls access.

The sudoers file controls who can run sudo and what commands they can run with elevated privileges.

🚀 Application

expert

How to run a command as another user with sudo?

You want to run the command whoami as the user 'alice' using sudo. Which command will do this correctly?

A sudo --user=whoami alice

B sudo whoami -u alice

C sudo -u alice whoami

D sudo alice whoami

💡 Hint

Look for the correct sudo option to specify a different user.

The option '-u' followed by the username runs the command as that user.