This EX200 practice question tests your understanding of create and configure file systems. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE of the following commands can be used to display information about file systems?
df
df displays mounted file system usage including size, used space, and mount points.
blkid
blkid shows UUID, file system type, and labels of block devices.
lsblk
lsblk lists block devices and their attributes such as size, type, and mount points.
fdisk
Why wrong: fdisk is used to manage partition tables, not to display file system information.
du
Why wrong: du shows disk usage for directories, not file system-level information.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
df
The `df` command displays information about mounted file systems, including total size, used space, available space, and mount points. It reads the /proc/mounts file to show file system usage statistics, making it a primary tool for file system information.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
df
Why this is correct
df displays mounted file system usage including size, used space, and mount points.
Related concept
Read the scenario before looking for a memorised answer.
blkid
Why this is correct
blkid shows UUID, file system type, and labels of block devices.
Related concept
Read the scenario before looking for a memorised answer.
lsblk
Why this is correct
lsblk lists block devices and their attributes such as size, type, and mount points.
Related concept
Read the scenario before looking for a memorised answer.
fdisk
Why it's wrong here
fdisk is used to manage partition tables, not to display file system information.
du
Why it's wrong here
du shows disk usage for directories, not file system-level information.
Common exam traps
Red Hat often tests the distinction between disk partitioning tools (fdisk) and file system information commands, so candidates mistakenly select fdisk because it lists partitions, but it does not display file system details like type or usage.
Trap categories for this question
Command / output trap
du shows disk usage for directories, not file system-level information.
Detailed technical explanation
Under the hood, `df` reads the statfs() system call to retrieve file system statistics, including block counts and inode information, and can show file system types (e.g., ext4, xfs) with the -T option. `blkid` queries the /dev/disk/by-uuid/ directory and reads the superblock of block devices to output UUID and filesystem type, while `lsblk` reads sysfs and udev data to list block devices and their relationships, including file system labels. In a real-world scenario, when troubleshooting a full root partition, `df -h` quickly shows usage, while `blkid` helps identify the correct device for resizing.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Create and configure file systems — This question tests Create and configure file systems — Read the scenario before looking for a memorised answer..
The correct answer is: df — The `df` command displays information about mounted file systems, including total size, used space, available space, and mount points. It reads the /proc/mounts file to show file system usage statistics, making it a primary tool for file system information.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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