LPIC-1 Devices, Filesystems and FHS Practice Question
A Linux technician receives a report that a USB flash drive inserted into a system is not automatically detected. Which command should the technician use to verify if the device is recognized by the kernel?
⚠ Common exam trap
Many exam-takers assume `lsusb` or `fdisk -l` are sufficient for kernel-level detection, but `lsusb` only confirms USB enumeration, not block device assignment, and `fdisk -l` requires prior kernel recognition.
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
✓
dmesg | tail
The `dmesg | tail` command displays kernel ring buffer messages, which include real-time hardware detection events such as USB device insertion. When a USB flash drive is plugged in, the kernel logs messages about device recognition, driver binding, and assigned device nodes (e.g., /dev/sdb). This makes it the most direct way to verify if the kernel has detected the device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
fdisk -l
Why it's wrong here
fdisk lists partitions but requires the device to be recognized first.
- ✗
lsusb
Why it's wrong here
lsusb lists USB devices but may not show kernel detection in real time without rescanning.
- ✗
blkid
Why it's wrong here
blkid shows block device attributes but only for devices already recognized by the kernel.
- ✓
dmesg | tail
Why this is correct
dmesg output includes kernel messages; tail shows the latest entries, including USB detection.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-1 exam.