Unit 7: User and Group Administration - Practice Quiz

1 In Linux, what is the primary purpose of a user account?

2 What is the numeric identifier assigned to each user account called?

3 What is a group in Linux primarily used for?

4 Which command is used to create a new user account in Linux?

5 Which option with useradd specifies a custom home directory for the new user?

6 Which useradd option assigns a specific UID to the new user?

7 Which command removes an existing user account from the system?

8 Which userdel option also removes the user's home directory and mail spool?

9 Which command is used to modify an existing user account?

10 Which usermod option is used to change a user's login name?

11 Which usermod option adds a user to a supplementary group without removing existing ones?

12 Which command is used to create a new group?

13 Which groupadd option specifies a particular GID for the new group?

14 Which command deletes an existing group from the system?

15 Which command is used to modify an existing group's properties?

16 Which groupmod option changes the name of an existing group?

17 Which command is used to change a user's password?

18 In modern Linux systems, where are the encrypted user passwords stored?

19 Which file contains basic information about user accounts such as username, UID, and home directory?

20 Which file stores group definitions and lists the members belonging to each group?

21 A system administrator runs useradd -m -s /bin/bash alice. What is the combined effect of the -m and -s options?

22 You want to delete the user bob and also remove his home directory and mail spool. Which command achieves this?

23 To add the existing user carol to the supplementary group developers without removing her from other groups, which command is correct?

24 In /etc/passwd, an entry reads dave:x:1005:1005:Dave K:/home/dave:/bin/bash. What does the x in the second field indicate?

25 An administrator needs to create a group named finance with a specific GID of 2000. Which command is correct?

26 The command passwd -l user1 is executed. What is the effect on user1?

27 To rename the group oldteam to newteam, which command should be used?

28 An attempt to run groupdel projects fails. Which of the following is the most likely reason?

29 The command usermod -L eve is run. What does this accomplish?

30 A line in /etc/group reads developers:x:2001:alice,bob. What do alice and bob represent in this entry?

31 Which command creates a system account svc with no login shell, commonly used for running services?

32 You want to force user2 to change their password at next login. Which command sets this?

33 The command usermod -d /home/newdir -m frank is executed. What happens?

34 How many colon-separated fields does a standard entry in /etc/passwd contain?

35 To change the GID of the group qa to 3000, which command is correct?

36 In Linux, what is the primary difference between a user's primary group and a supplementary group?

37 Where does useradd read default values (like default shell and home base) from when options are not specified?

38 The chage -l user3 command is used primarily to display what information?

39 When a new user is created without specifying a group, what typically happens on a system using the user private group (UPG) scheme?

40 A user account has the shell field in /etc/passwd set to /usr/sbin/nologin. What is the practical effect?

41 A line in /etc/passwd reads:


john:x:1005:1005::/home/john:/sbin/nologin


What is the practical consequence of the final field combined with the second field?

42 A user dev currently belongs to groups dev, docker, and sudo. An admin runs:


usermod -G project dev


What happens to the user's group membership?

43 An admin wants to create a system account backup with no login shell, no home directory creation, and a UID below 1000. Which command is correct?

44 A user alice is currently logged in with a running process. An admin runs userdel -r alice. What is the most likely outcome?

45 In /etc/shadow, a user's entry has the fields ... :18000:0:90:7:14: :. What does the value 14 (the sixth field after last-change) represent?

46 A group staff has GID 1010. An admin runs groupmod -g 1200 staff. Which statement about existing files is correct?

47 Two users, bob (UID 1002) and carol (UID 1002), both appear in /etc/passwd with the same UID. What is the security/functional implication?

48 An admin needs to create a group ops with a specific GID 600, but GID 600 is already in use. Which command creates the group while allowing the duplicate GID?

49 An admin runs passwd -l alice followed by passwd -S alice, which shows status L. What exactly did the lock do?

50 An admin wants to change user sam's home directory to /data/sam AND move the existing files. Which single command achieves both?

51 In /etc/group, the entry wheel:x:10:root,admin lists members. If user admin also has wheel as their primary group in /etc/passwd, will admin appear in the groups admin output for wheel?

52 Given /etc/default/useradd defines SHELL=/bin/bash and /etc/login.defs sets CREATE_HOME yes, an admin runs useradd -s /bin/zsh dan. Which shell and home behavior result?

53 An admin attempts groupdel developers, but the command fails. developers is the primary group of user eve. Why does it fail?

54 An admin runs chage -M 60 -W 10 -I 5 frank. If frank's password was last changed on day 0, on which day (approximately) does the account become inactive/locked?

55 An admin runs usermod -L -e 1 grace. What is the combined effect?

56 A corrupted /etc/passwd line reads:


henry:x:1007:1007:Henry:/home/henry


What is the effect of the missing seventh field?

57 A user needs group data's permissions for a new file they just created, but their session started before they were added to data via usermod -aG data user. Why does newgrp data help but re-login does not immediately?

58 An admin runs groupmod -n engineers devs. After this, what is true about files previously owned by group devs?

59 After running userdel ivan (without -r), an admin creates a new user julia who receives ivan's old UID. What risk exists regarding ivan's leftover files?

60 An admin runs useradd -u 0 -o -g 0 shadowroot. What is the outcome and its significance?