010-160 - LPI Linux Essentials Users and Group Management Questions and Answers

Question 1

A system administrator needs to create a new user named 'jdoe' and ensure their home directory is created at the same time. Which command will accomplish this?

Accepted Answer

useradd -m jdoe

Answer

The `useradd` command is used to create a new user. By default, it may not create the user's home directory. The `-m` option explicitly tells the command to create the user's home directory, which is typically located in `/home/`.

Question 2

Which file contains the user's encrypted password and password aging information?

Accepted Answer

/etc/shadow

Answer

The `/etc/shadow` file securely stores user password information. It contains the encrypted password hash and other details like password expiration policies. This file is readable only by the root user to enhance security.

Question 3

An administrator wants to add an existing user, 'sara', to the supplementary group 'developers'. Which of the following commands is the correct and safest way to do this without affecting her current group memberships?

Accepted Answer

usermod -a -G developers sara

Answer

The `usermod` command modifies a user's account. The `-G` option is used to specify a list of supplementary groups. Crucially, the `-a` (append) option must be used with `-G` to add the user to the new group without removing them from their existing supplementary groups.

Question 4

A project is complete and the user account 'tempuser' is no longer needed. A system administrator needs to delete the user and also remove their home directory and all its contents. Which command should be used?

Accepted Answer

userdel -r tempuser

Answer

The `userdel` command is used to delete a user account. By itself, it may leave the user's home directory on the system. The `-r` option tells `userdel` to also remove the user's home directory and mail spool, ensuring a complete cleanup.

Question 5

What is the primary purpose of a user's primary group in Linux?

Accepted Answer

To set the default group ownership for files and directories the user creates.

Answer

When a user creates a new file or directory, the system assigns group ownership. By default, this ownership is assigned to the user's primary group. Each user must belong to exactly one primary group.

(010-160) LPI Linux Essentials Practice Test

(010-160) LPI Linux Essentials Practice Test

010-160 - LPI Linux Essentials Users and Group Management Questions and Answers