010-160 Users and Group Management 2

Question 1

Which file stores the encrypted passwords for user accounts on a modern Linux system?

Accepted Answer

/etc/shadow

Answer

Modern Linux systems store encrypted passwords in /etc/shadow, which is readable only by root.

Question 2

What command would you use to lock a user account so they cannot log in?

Accepted Answer

usermod -L

Answer

usermod -L locks a user account by prepending a '!' to the password hash in /etc/shadow.

Question 3

Which field in /etc/passwd specifies the user's default shell?

Accepted Answer

Field 7

Answer

The seventh (last) field in /etc/passwd specifies the user's login shell, e.g., /bin/bash.

Question 4

What does the command 'id username' display?

Accepted Answer

The user's UID, GID, and group memberships

Answer

The id command displays a user's numeric UID, primary GID, and all supplementary group memberships.

Question 5

Which command removes a user and their home directory from the system?

Accepted Answer

userdel -r username

Answer

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

(010-160) LPI Linux Essentials Practice Test