Quick Answer
The answer is `cat /proc/cmdline`. This is the correct command because the Linux kernel stores all boot parameters—often called the kernel command line—passed by the bootloader (such as GRUB) in the virtual file `/proc/cmdline`, which is a pseudo-filesystem interface that reflects kernel data structures at runtime. Reading this file directly displays the exact parameters used during boot, including critical entries like `root=`, `quiet`, or `splash`. On the LPIC-2 exam, this question tests your understanding of the `/proc` filesystem as a real-time kernel information source, and a common trap is confusing it with `/proc/version` or `/proc/cpuinfo`, which show different system details. Remember that `cmdline` is short for command line, so think of it as the kernel’s own startup arguments. A useful memory tip: “Cat the command line to see what the kernel was told at boot time.”
This LPIC-2 practice question tests your understanding of linux kernel and system startup. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A system administrator needs to find out which kernel parameters were passed at boot time. Which command displays the kernel boot parameters?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
cat /proc/cmdline
/proc/cmdline contains the boot parameters.
dmesg
Why wrong: dmesg shows kernel messages, but not specifically boot parameters.
lsmod
Why wrong: lsmod lists loaded kernel modules.
cat /proc/version
Why wrong: /proc/version shows kernel version, not boot parameters.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
cat /proc/cmdline
The correct command is `cat /proc/cmdline` because the Linux kernel stores the boot parameters (also known as the kernel command line) passed by the bootloader (e.g., GRUB) in the virtual file `/proc/cmdline`. Reading this file directly displays the exact parameters used during boot, such as `root=`, `quiet`, or `splash`.
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.
cat /proc/cmdline
Why this is correct
/proc/cmdline contains the boot parameters.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
dmesg
Why it's wrong here
dmesg shows kernel messages, but not specifically boot parameters.
lsmod
Why it's wrong here
lsmod lists loaded kernel modules.
cat /proc/version
Why it's wrong here
/proc/version shows kernel version, not boot parameters.
Common exam traps
The trap here is that candidates confuse `dmesg` (which shows boot messages) with the direct kernel command line, or assume `lsmod` or `/proc/version` might contain boot parameters, when only `/proc/cmdline` provides the exact boot-time arguments.
Trap categories for this question
Command / output trap
dmesg shows kernel messages, but not specifically boot parameters.
Detailed technical explanation
The kernel command line is passed from the bootloader (e.g., GRUB) via the `boot_params` structure in x86 architecture, and the kernel stores it in a static buffer that is exposed through the `procfs` filesystem. This file is read-only and contains space-separated parameters; it is often used by systemd or init scripts to determine boot behavior, such as enabling `systemd.debug-shell` for emergency troubleshooting.
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 LPIC-2 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
The correct answer is: cat /proc/cmdline — The correct command is `cat /proc/cmdline` because the Linux kernel stores the boot parameters (also known as the kernel command line) passed by the bootloader (e.g., GRUB) in the virtual file `/proc/cmdline`. Reading this file directly displays the exact parameters used during boot, such as `root=`, `quiet`, or `splash`.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This LPIC-2 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-2 exam.
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