Users

Question 1

Three types of accounts

Answer 1

root, standard user and service

Question 2

command to edit the /etc/sudoers file, verifies for errors before commiting changes

Answer 2

visudo

Question 3

check existing sudoers file for errors

Answer 3

visudo -c

Question 4

check a sudoers file in a different location than the default

Answer 4

visudo -f {file location} -c

Question 5

check sudoers file in strict mode, any aliases that are used before being defined will result in errors

Answer 5

visudo -s

Question 6

output the sudoers file to a specified file in JSON format

Answer 6

visudo -x {filename}

Question 7

command to create user accounts and configure basic settings (does not create a password)

Answer 7

useradd [options] [user name]

Question 8

location where account is stored

Answer 8

/etc/passwd

Question 9

a new account is configured according to options in this file

Answer 9

/etc/login.defs

Question 10

Account home directory is populated with files from this directory

Answer 10

/etc/skel

Question 11

useradd option for comment (usually used as field for user’s name)

Answer 11

-c

Question 12

useradd option for expiration date

Answer 12

-e

Question 13

useradd option set default shell

Answer 13

-s

Question 14

useradd option view default config for new users

Answer 14

-D

Question 15

command used to create a password for a new user created with useradd command

Answer 15

passwd

Question 16

file that stores user account information

Answer 16

/etc/passwd

Question 17

file owned by root that stores hashed password

Answer 17

/etc/shadow

Question 18

command used to control password expiration, expiration warnings, inactive days and other info for existing accounts

Answer 18

chage [options] {user name}

change age

Question 19

Set account to expire at specific date and time

Answer 19

chage -E 2022/12/31 brian

Question 20

option to list password aging information

Answer 20

chage -l brian

Question 21

option to set max days the password is valid

Answer 21

chage -M 90 brian

Question 22

option to set min number of days until password can be changed

Answer 22

chage -m 1 brian

Question 23

sets number of days before expiration that user will be warned to change their password

Answer 23

chage -W 5 brian

Question 24

command used to modify settings for regular users (edits the /etc/passwd file)

Answer 24

usermod [options] {username}

Question 25

modify comment field of user

Answer 25

usermod -c “User One” user1

Question 26

modify account expiration date

Answer 26

usermod -e 2020/12/31 user1

Question 27

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

Answer 27

usermod -aG sales-group user1

Question 28

modify a user’s login name

Answer 28

usermod -l user99 user1

Question 29

two commands to lock a users account

Answer 29

passwd -l {user name}

usermod -L {user name}

Question 30

two commands to unlock a users account

Answer 30

passwd -u {username}

usermod -U {user name}

Question 31

command used to delete user accounts

Answer 31

userdel [options] {user names}

Question 32

command to delete an account and remove the users home directory

Answer 32

userdel -r brian