XK0-006 System Management Practice Question
Which command displays the amount of free and used disk space on all mounted file systems in a human-readable format?
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
✓
df -h
df -h shows disk space in human-readable units. du shows disk usage per directory; lsblk lists block devices; mount shows mounted filesystems but not space usage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
du -h /
Why it's wrong here
du shows directory usage, not filesystem-wide space.
- ✗
lsblk -h
Why it's wrong here
lsblk lists block devices, not space usage.
- ✗
mount -h
Why it's wrong here
mount shows mounted filesystems, not space.
- ✓
df -h
Why this is correct
Correct: df -h shows free/used space.
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