Linux User Management 5

Question 1

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

Accepted Answer

Prevents the user from getting an interactive login shell

Answer

/sbin/nologin is a placeholder shell that prints a message and exits, preventing interactive logins while allowing other service authentications.

Question 2

Which command shows the password aging information for a user named 'carol'?

Accepted Answer

chage -l carol

Answer

chage -l displays password aging details including last change, expiry, and warning dates for the specified user.

Question 3

When using `visudo`, what is the correct syntax to allow user 'dave' to run all commands as root without a password?

Accepted Answer

dave ALL=(ALL) NOPASSWD: ALL

Answer

The NOPASSWD: keyword in the sudoers rule skips password prompting for the specified commands.

Question 4

What does the `pwck` command do?

Accepted Answer

Verifies the integrity of /etc/passwd and /etc/shadow files

Answer

pwck validates /etc/passwd and /etc/shadow for consistency, detecting duplicate UIDs, missing home directories, and format errors.

Question 5

Which command would delete the group 'contractors' from the system?

Accepted Answer

groupdel contractors

Answer

groupdel removes the specified group from /etc/group and /etc/gshadow.

Linux Practice Test