Quick Answer
The correct answer is `head data.csv`. The `head` command is a standard Unix utility that, by default, outputs the first 10 lines of any given file, making it the precise tool for this task. On the Linux Foundation Certified System Administrator (LFCS) exam, this question tests your familiarity with core file-viewing commands, often contrasting `head` with `tail` (which shows the last lines) or `cat` (which displays the entire file). A common trap is confusing `head` with `less` or `more`, which are pagers and do not limit output to a specific line count by default. To remember, think of the literal meaning: the "head" of the file is its beginning, and the default count is ten. For a quick memory tip, associate "head" with "top ten"—just as a top-ten list shows the first ten items, `head` shows the first ten lines.
This LFCS practice question tests your understanding of essential commands. 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 junior administrator needs to display the first 10 lines of a file named 'data.csv'. Which command should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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.
head data.csv
Correctly displays first 10 lines.
less data.csv
Why wrong: Opens file in interactive viewer showing entire content.
tail data.csv
Why wrong: Displays last 10 lines.
cat data.csv
Why wrong: Displays entire file.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
head data.csv
The `head` command is specifically designed to display the first 10 lines of a file by default. Running `head data.csv` will output the first 10 lines of the CSV file, making it the correct choice for this task.
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.
head data.csv
Why this is correct
Correctly displays first 10 lines.
Clue confirmation
The clue words "first", "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
less data.csv
Why it's wrong here
Opens file in interactive viewer showing entire content.
tail data.csv
Why it's wrong here
Displays last 10 lines.
cat data.csv
Why it's wrong here
Displays entire file.
Common exam traps
The trap here is that candidates may confuse `head` with `tail` or `less`, thinking any command that displays file content can be used, but the exam specifically tests knowledge of the default behavior of each command for displaying the first lines of a file.
Trap categories for this question
Command / output trap
Opens file in interactive viewer showing entire content.
Detailed technical explanation
The `head` command reads from the file descriptor and outputs the specified number of lines (default 10) by buffering input line by line. It is efficient for large files because it stops reading after the requested lines, unlike `cat` which reads the entire file. In real-world scenarios, `head` is often used to preview log files or CSV headers without loading the full dataset into memory.
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 LFCS 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.
Essential Commands — study guide chapter
Learn the concepts, then practise the questions
Essential Commands practice questions
Targeted practice on this topic area only
All LFCS questions
513 questions across all exam domains
Linux Foundation Certified System Administrator LFCS study guide
Full concept coverage aligned to exam objectives
LFCS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise LFCS questions linked to User and Group Management.
Practise LFCS questions linked to Operation of Running Systems.
Practise LFCS questions linked to Essential Commands.
Practise LFCS questions linked to Networking.
Practise LFCS questions linked to Service Configuration.
Practise LFCS questions linked to Storage Management.
Practise LFCS questions linked to LFCS fundamentals.
Practise LFCS questions linked to LFCS scenario.
Practise LFCS questions linked to LFCS troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
The correct answer is: head data.csv — The `head` command is specifically designed to display the first 10 lines of a file by default. Running `head data.csv` will output the first 10 lines of the CSV file, making it the correct choice for this task.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first", "which command". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
Last reviewed: Jun 11, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.