5.2 Creating Users and Groups

Question 1

Users|Groups

a file of seven colon-delimited fields containing basic information about users

Answer 1

/etc/passwd

Question 2

Users|Groups

a file of four colon-delimited fields containing basic information about groups

Answer 2

/etc/group

Question 3

Users|Groups

a file of nine colon-delimited fields containing encrypted user pws

Answer 3

/etc/shadow

Question 4

Users|Groups

a file of four colon-delimited fields file containing encrypted group passwords

Answer 4

/etc/gshadow

Question 5

Users|Groups

world-readable file that contains a list of users, each on a separate line

Answer 5

/etc/passwd

Question 6

Users|Groups

File: /etc/passwd
name used when user logs into system

Answer 6

Username

Question 7

Users|Groups

File: /etc/passwd
encrypted pw or an x if shadow pw used

Answer 7

Password

Question 8

Users|Groups

File: /etc/passwd
ID number assigned to the user in the system

Answer 8

User ID (UID)

Question 9

Users|Groups

File: /etc/passwd
Primary group number of the user in the system

Answer 9

Group ID (GID)

Question 10

Users|Groups

File: /etc/passwd
optional comment field used to add extra info about the user - such as full name - and can contain multiple comma-separated entries.

Answer 10

GECOS

Question 11

Users|Groups

File: /etc/passwd
absolute path of the user’s home directory

Answer 11

Home Directory

Question 12

Users|Groups

File: /etc/passwd
Absolute path of the program automatically launched when the user logs into the system -

Answer 12

Shell

usually an interactive one like /bin/bash

Question 13

Users|Groups

world-readable file that contains list of groups - each on a separate line

Answer 13

/etc/group

Question 14

Users|Groups

file /etc/passwd
name used when the user logs into the system

Answer 14

Username

Question 15

Users|Groups

file /etc/passwd
encrypted password or an x if shadow pw used

Answer 15

Password

Question 16

Users|Groups

file /etc/passwd
ID number assigned to the user in the system

Answer 16

User ID (UID)

Question 17

Users|Groups

file /etc/passwd
Primary group number of the user in the system

Answer 17

Group ID (GID)

Question 18

Users|Groups

comma-delimited list of users belonging to the group, except those for whom this is the primary group

Answer 18

Member list

Question 19

Users|Groups

The encrypted password of the user (if the value is !, the account is locked).

Answer 19

Encrypted password

Question 20

Users|Groups

The date of the last password change, as number of days since 01/01/1970. A value of 0 means that the user must change the pw at the next access.

Answer 20

Date of last password change

Question 21

Users|Groups

The minimum number of days, after a password change, which must pass before the user will
be allowed to change the password again

Answer 21

Minimum password age

Question 22

Users|Groups

The maximum number of days that must pass before a password change is required.

Answer 22

Max pw age

Question 23

Users|Groups

The number of days, before the password expires, during which the user is warned that the
password must be changed

Answer 23

PW warning period

Question 24

Users|Groups

The number of days after a password expires during which the user should update the
password. After this period, if the user does not change the password, the account will be
disabled.

Answer 24

PW inactivity period

Question 25

Users|Groups

The date, as number of days since 01/01/1970, in which the user account will be disabled. An
empty field means that the user account will never expire.

Answer 25

Account expiration date

Question 26

Users|Groups

field reserved for future use

Answer 26

reserved field

Question 27

Users|Groups

A comma-delimited list of the administrators of the group (they can change the password of the
group and can add or remove group members with the gpasswd command).

Answer 27

Group administrators

Question 28

Users|Groups

useradd option

create user account with custom comments

Answer 28

useradd -c

Question 29

Users|Groups

useradd option

create new user account with custom home directory

Answer 29

useradd -d

Question 30

Users|Groups

useradd option

create new user account by setting specific date on which it will be disabled.

Answer 30

useradd -e

Question 31

Users|Groups

useradd option

Create a new user account by setting the number of days after the password expires during
which the user should update the password

Answer 31

useradd -f

Question 32

Users|Groups

useradd option

Create a new user account with a specific GID

Answer 32

useradd -g

Question 33

Users|Groups

useradd option

create new user account by adding it to multiple secondary groups

Answer 33

useradd -G

Question 34

Users|Groups

useradd option

Create a new user account with its home directory.

Answer 34

useradd -m

Question 35

Users|Groups

useradd option

Create a new user account without its home directory.

Answer 35

useradd -M

Question 36

Users|Groups

useradd option

Create a new user account with a specific login shell

Answer 36

useradd -s

Question 37

Users|Groups

useradd option

create a new user account with a specific UID

Answer 37

useradd -u

Question 38

Users|Groups

passwd option

delete password of a user account - thus setting an empty pw making it a passwordless ccount

Answer 38

passwd -d

Question 39

Users|Groups

passwd option

force the user account to change the pw

Answer 39

passwd -e

Question 40

Users|Groups

passwd option

lock the user account - encrypted pw is prefixed with an exclamation mark

Answer 40

passwd -l

Question 41

Users|Groups

passwd option

unlock the user account and the exclamation mark is removed

Answer 41

passwd -u

Question 42

Users|Groups

passwd option

output info about the pw status for a specific account

Answer 42

passwd -S