EX200 Primary group Practice Question
Which TWO commands can change the primary group of an existing user?
⚠ Common exam trap
The trap is assuming that `usermod -aG` or `gpasswd -a` can change the primary group when they actually manage supplementary group membership only.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
usermod -aG
None of the listed commands change the primary group of an existing user. The correct commands are `usermod -g` to change the primary group directly, or `groupmod -g` after ensuring the user is the only member of the group.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
usermod -aG
Why this is correct
`usermod -aG` adds the user to a supplementary group, not the primary group.
- ✓
gpasswd -a
Why this is correct
`gpasswd -a` adds the user to a supplementary group, not the primary group.
- ✗
vigr
Why it's wrong here
`vigr` edits /etc/group but does not change a user's primary group membership.
- ✗
groupmems -a
Why it's wrong here
`groupmems -a` adds the user to a supplementary group, not the primary group.
- ✗
useradd -G
Why it's wrong here
`useradd -G` sets supplementary groups for a new user and does not affect an existing user's primary group.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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