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XK0-006 Practice Question: A junior administrator needs to check the disk…
A junior administrator needs to check the disk usage of the /var filesystem to ensure it does not exceed 80% capacity. Which command should be used?
⚠ Common exam trap
Candidates often confuse `du` (directory usage) with `df` (filesystem usage), leading them to pick `du -sh /var` when they need to check overall filesystem capacity, not just the size of the directory contents.
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 /var
The `df -h /var` command displays disk usage for the `/var` filesystem in human-readable format (e.g., GB, MB). This is the correct tool to check filesystem capacity and usage percentage, which directly answers whether usage exceeds 80%.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
df -h /var
Why this is correct
The `df -h` command with the `/var` argument queries the kernel’s mounted-filesystem table for the `/var` mount point, reporting used blocks and inodes in human-readable units (e.g., GiB). The `-h` flag converts raw 1024-byte blocks into scaled output, enabling the junior administrator to compare the “Use%” column directly against the 80% capacity constraint specified in the stem.
- ✗
fdisk -l /var
Why it's wrong here
fdisk manipulates partition tables, not usage.
- ✗
du -sh /var
Why it's wrong here
du shows directory usage, not filesystem-level summary.
- ✗
lsblk /var
Why it's wrong here
lsblk lists block devices, not usage.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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