Managing Users and Groups

Question 1

/etc/passwd file contents

Answer 1

Stores User account information

Question 2

/etc/shadow file contents

Answer 2

Hashed passwords, password requirements and expiration information

Question 3

chage command

Answer 3

change age command, used to control password, expiration, expiration warnings, inactive days, and other information for existing accounts

Question 4

Usermod -aG command

Answer 4

Adds user to a group and keeps them in their existing groups

Question 5

usermod -l

Answer 5

changes the user’s login name

Question 6

usermod -c

Answer 6

sets the comment field

Question 7

List two commands to lock a user

Answer 7

passwd -l {user name}

Usermod -L {user name}

Question 8

List two commands to unlock a user

Answer 8

passwd -u {user name}

Usermod -L {user name}

Question 9

/etc/group file contents

Answer 9

storage and information location about all the groups on a system

Question 10

Groupadd command

Answer 10

creates a group

Question 11

Groupmod command

Answer 11

Used to change the group’s own attributes

Question 12

Groupdel command

Answer 12

Delete groups from the /etc/group file

Question 13

Groupmod -g command

Answer 13

change the group ID

Question 14

Groupmod -n command

Answer 14

rename a group

Question 15

whoami command

Answer 15

Used to display the user name with which you are logged in to the system

Question 16

who command

Answer 16

Used to determine the details of users currently logged in to a system

Question 17

W command

Answer 17

primarily used to display the details of users who are currently logged in to a system

Question 18

Last command

Answer 18

Displays the history of user login and logout actions, along with the actual time and date

Question 19

ID command

Answer 19

Used to display user ID and group ID information

Question 20

.bashrc file

Answer 20

enables customization of the user’s own environment

Question 21

.bash_profile

Answer 21

Provides shell configuration for the initial login environment

Question 22

/etc/skel

Answer 22

Contents of this file are copied into the home directories of new users

Question 23

/etc/profile

Answer 23

Provides system-wide environment variables

run only at login

Question 24

.profile

Answer 24

user-specific bash customizations are pulled from the .profile file

Question 25

/etc/profile.d/

Answer 25

storage locations for scripts

Question 26

sudoedit command

Answer 26

Permits a user to edit a file with their own credentials, even if the file is only available to the root user
Must make an entry in the sudoers file to use

Question 27

visudo command

Answer 27

when using, the system verifies the syntax of the /etc/sudoers file before committing changes
enabling the administrator an opportunity to correct mistakes before they become part of the configuration

Question 28

The Wheel Group

Answer 28

Members of this group exercise the adminsitrative privileges of root with less potential for damaging the system
visudo to edit privileges

Question 29

useradd command

Answer 29

used to create user accounts and configure basic settings
stored in the /etc/passwd
configured according to various options set in /etc/login.defs

Question 30

useradd -c

Answer 30

sets the comment field, which is typically used as the field for the user’s full name

Question 31

useradd -e

Answer 31

sets the account expiration date

Question 32

useradd -s

Answer 32

sets the user’s default shell

Question 33

useradd -D

Answer 33

view the default configuration for new users