LFCS User and Group Management Practice Question
An administrator wants to change the primary group of user 'jane' from 'staff' to 'developers'. Which command accomplishes this?
⚠ Common exam trap
Many candidates confuse the `-g` (primary group) and `-G` (supplementary groups) options of `usermod`, leading candidates to mistakenly choose the uppercase `-G` option when the question explicitly asks for a primary group change.
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 -g developers jane
The `usermod -g` command changes the primary group of a user. The `-g` option specifies the new primary group (by name or GID), and the user's existing primary group is replaced. This directly accomplishes the administrator's goal of changing jane's primary group from 'staff' to 'developers'.
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 -g developers jane
Why this is correct
Correct: -g sets the primary group.
- ✗
usermod -G developers jane
Why it's wrong here
-G adds secondary groups, not primary.
- ✗
groupmod -g developers jane
Why it's wrong here
groupmod modifies group attributes, not user's group.
- ✗
chgrp developers jane
Why it's wrong here
chgrp changes group ownership of files, not user's group.
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