1. What does useradd -m alice do?
Junior- A.set or change a user's password
- B.create a user 'alice' with a home directory
- C.add a user to a supplementary group (e.g. wheel)
- D.show a user's UID, GID and group memberships
Linux · Users & Groups interview questions
21 real Linux · Users & Groups questions from the System Administration bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What does
Junior2. Which command will create a user 'alice' with a home directory?
Junior- A.gpasswd -a alice docker
- B.userdel -r alice
- C.id alice
- D.useradd -m alice
3. Which statement is correct?
Junior- A.useradd -m alice — add a user to a group via gpasswd
- B.useradd -m alice — set or change a user's password
- C.useradd -m alice — show a user's UID, GID and group memberships
- D.useradd -m alice — create a user 'alice' with a home directory
4. What does passwd alice do?
Junior- A.delete a user and remove their home directory
- B.set or change a user's password
- C.add a user to a group via gpasswd
- D.create a user 'alice' with a home directory
5. Which command will set or change a user's password?
Junior- A.passwd alice
- B.whoami
- C.id alice
- D.gpasswd -a alice docker
6. Which statement is correct?
Junior- A.passwd alice — set or change a user's password
- B.passwd alice — delete a user and remove their home directory
- C.passwd alice — create a user 'alice' with a home directory
- D.passwd alice — add a user to a group via gpasswd
7. What does id alice do?
Junior- A.print the current effective username
- B.add a user to a supplementary group (e.g. wheel)
- C.show a user's UID, GID and group memberships
- D.set or change a user's password
8. Which command will show a user's UID, GID and group memberships?
Junior- A.userdel -r alice
- B.gpasswd -a alice docker
- C.usermod -aG wheel alice
- D.id alice
9. Which statement is correct?
Junior- A.id alice — add a user to a group via gpasswd
- B.id alice — create a user 'alice' with a home directory
- C.id alice — set or change a user's password
- D.id alice — show a user's UID, GID and group memberships
10. What does whoami do?
Junior- A.print the current effective username
- B.set or change a user's password
- C.show a user's UID, GID and group memberships
- D.delete a user and remove their home directory
11. Which command will print the current effective username?
Junior- A.useradd -m alice
- B.gpasswd -a alice docker
- C.usermod -aG wheel alice
- D.whoami
12. Which statement is correct?
Junior- A.whoami — add a user to a supplementary group (e.g. wheel)
- B.whoami — print the current effective username
- C.whoami — add a user to a group via gpasswd
- D.whoami — create a user 'alice' with a home directory
13. What does usermod -aG wheel alice do?
Mid- A.create a user 'alice' with a home directory
- B.add a user to a supplementary group (e.g. wheel)
- C.add a user to a group via gpasswd
- D.show a user's UID, GID and group memberships
14. Which command will add a user to a supplementary group (e.g. wheel)?
Mid- A.usermod -aG wheel alice
- B.whoami
- C.userdel -r alice
- D.id alice
15. Which statement is correct?
Mid- A.usermod -aG wheel alice — print the current effective username
- B.usermod -aG wheel alice — add a user to a supplementary group (e.g. wheel)
- C.usermod -aG wheel alice — show a user's UID, GID and group memberships
- D.usermod -aG wheel alice — set or change a user's password
16. What does userdel -r alice do?
Mid- A.add a user to a group via gpasswd
- B.set or change a user's password
- C.print the current effective username
- D.delete a user and remove their home directory
17. Which command will delete a user and remove their home directory?
Mid- A.userdel -r alice
- B.gpasswd -a alice docker
- C.whoami
- D.id alice
18. Which statement is correct?
Mid- A.userdel -r alice — add a user to a group via gpasswd
- B.userdel -r alice — create a user 'alice' with a home directory
- C.userdel -r alice — show a user's UID, GID and group memberships
- D.userdel -r alice — delete a user and remove their home directory
19. What does gpasswd -a alice docker do?
Mid- A.add a user to a supplementary group (e.g. wheel)
- B.show a user's UID, GID and group memberships
- C.print the current effective username
- D.add a user to a group via gpasswd
20. Which command will add a user to a group via gpasswd?
Mid- A.whoami
- B.passwd alice
- C.usermod -aG wheel alice
- D.gpasswd -a alice docker
21. Which statement is correct?
Mid- A.gpasswd -a alice docker — set or change a user's password
- B.gpasswd -a alice docker — create a user 'alice' with a home directory
- C.gpasswd -a alice docker — add a user to a group via gpasswd
- D.gpasswd -a alice docker — print the current effective username
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