LFCS Certification User and Group Management 2

Question 1

Which file stores hashed passwords and password aging information for local user accounts on Linux?

Accepted Answer

/etc/shadow

Answer

/etc/shadow stores hashed passwords along with password aging fields such as last change date, min/max age, and expiry.

Question 2

A user needs to be added to the 'docker' group without logging out. Which command applies the new group membership to the current shell session?

Accepted Answer

newgrp docker

Answer

newgrp docker starts a new shell with the specified group as the primary group, applying membership immediately without a full re-login.

Question 3

What is the effect of setting a user's shell to /sbin/nologin in /etc/passwd?

Accepted Answer

The user cannot log in interactively

Answer

Setting the shell to /sbin/nologin prevents interactive login while still allowing the account to be used for services.

Question 4

Which command displays the numeric UID and GID, and all supplementary groups, for the currently logged-in user?

Accepted Answer

id

Answer

The id command prints the real UID, primary GID, and all supplementary group IDs and names for the current user.

Question 5

An administrator wants to force a user to change their password on next login. Which command accomplishes this?

Accepted Answer

chage -d 0 username

Answer

chage -d 0 sets the last password change date to the epoch, which forces the system to require a password change at next login.

LFCS Certification Practice Test