010-160 System Security & User Permissions 5

Question 1

Which /etc/passwd field specifies a user's home directory?

Accepted Answer

Field 6

Answer

Field 6 (the sixth colon-delimited field) in /etc/passwd specifies the user's home directory path.

Question 2

What does the `su -` command do differently than `su`?

Accepted Answer

Starts a login shell that loads the target user's full environment

Answer

`su -` (or `su -l`) starts a login shell, sourcing the target user's profile and environment variables.

Question 3

How can you allow a user to run only the `reboot` command with sudo without a password?

Accepted Answer

Add 'username ALL=(ALL) NOPASSWD: /sbin/reboot' to /etc/sudoers

Answer

A NOPASSWD rule in /etc/sudoers grants passwordless sudo access to a specific command.

Question 4

What is the UID of the root user on a standard Linux system?

Accepted Answer

0

Answer

Root always has UID 0, which grants unrestricted access to the system.

Question 5

Which command removes a user account along with their home directory?

Accepted Answer

userdel -r username

Answer

`userdel -r username` deletes the user account and recursively removes their home directory and mail spool.

(010-160) LPI Linux Essentials Practice Test