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 user needs to see the contents of a gzip-compressed file 'data.txt.gz' without decompressing it. Which command is appropriate?
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.
gunzip data.txt.gz
Why wrong: Decompresses the file and removes .gz.
zcat data.txt.gz
Displays compressed file contents without decompressing.
./data.txt.gz
Why wrong: Attempts to execute the file.
gzcat data.txt.gz
Why wrong: Not a standard command on most Linux distributions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
zcat data.txt.gz
The `zcat` command reads a gzip-compressed file and outputs its decompressed content to stdout without modifying the original file. This allows the user to view the contents of 'data.txt.gz' without permanently decompressing it.
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.
gunzip data.txt.gz
Why it's wrong here
Decompresses the file and removes .gz.
zcat data.txt.gz
Why this is correct
Displays compressed file contents without decompressing.
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.
./data.txt.gz
Why it's wrong here
Attempts to execute the file.
gzcat data.txt.gz
Why it's wrong here
Not a standard command on most Linux distributions.
Common exam traps
The trap here is that candidates may confuse `zcat` with `gunzip` or assume `gzcat` is the correct command, but the LFCS exam expects knowledge of the standard `zcat` utility for viewing compressed files without decompression.
Trap categories for this question
Command / output trap
Not a standard command on most Linux distributions.
Detailed technical explanation
The `zcat` command is essentially a wrapper for `gzip -dc`, where `-d` enables decompression and `-c` writes output to stdout. This is useful for inspecting logs or configuration files that are compressed for storage, such as in /var/log/ with log rotation. Under the hood, `zcat` reads the gzip magic bytes (0x1f 0x8b) and decompresses the deflate stream on the fly.
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.
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FAQ
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
The correct answer is: zcat data.txt.gz — The `zcat` command reads a gzip-compressed file and outputs its decompressed content to stdout without modifying the original file. This allows the user to view the contents of 'data.txt.gz' without permanently decompressing it.
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 25, 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.
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