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 wants to view the contents of a compressed file file.txt.gz without decompressing it permanently. Which two commands can be used? (Choose two.)
gunzip -c file.txt.gz
Outputs decompressed content to stdout, leaving the .gz file untouched.
zcat file.txt.gz
Outputs decompressed content to stdout without saving.
gzip -l file.txt.gz
Why wrong: Lists compression information, not the contents.
gzip -d file.txt.gz
Why wrong: Decompresses and creates file.txt, removing the .gz file.
gzip -k file.txt.gz
Why wrong: Compresses, not decompresses.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
gunzip -c file.txt.gz
Option A is correct because `gunzip -c` decompresses the file to standard output, allowing the user to view the contents without modifying the original compressed file. Option B is correct because `zcat` is equivalent to `gunzip -c` and reads the compressed file directly, outputting the decompressed data to the terminal without permanent decompression.
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 -c file.txt.gz
Why this is correct
Outputs decompressed content to stdout, leaving the .gz file untouched.
Related concept
Read the scenario before looking for a memorised answer.
zcat file.txt.gz
Why this is correct
Outputs decompressed content to stdout without saving.
Related concept
Read the scenario before looking for a memorised answer.
gzip -l file.txt.gz
Why it's wrong here
Lists compression information, not the contents.
gzip -d file.txt.gz
Why it's wrong here
Decompresses and creates file.txt, removing the .gz file.
gzip -k file.txt.gz
Why it's wrong here
Compresses, not decompresses.
Common exam traps
The trap here is that candidates confuse `gzip -d` (which permanently decompresses) with `gunzip -c` (which outputs to stdout), or mistakenly think `gzip -l` shows file contents instead of metadata.
Detailed technical explanation
Under the hood, `gunzip -c` and `zcat` both invoke the same decompression routine from the zlib library, reading the gzip magic bytes (1f 8b) and inflating the Deflate-compressed data stream to stdout. In real-world scenarios, administrators often use these commands to inspect log files or configuration backups without altering the compressed archive, preserving disk space and avoiding accidental overwrites.
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: gunzip -c file.txt.gz — Option A is correct because `gunzip -c` decompresses the file to standard output, allowing the user to view the contents without modifying the original compressed file. Option B is correct because `zcat` is equivalent to `gunzip -c` and reads the compressed file directly, outputting the decompressed data to the terminal without permanent decompression.
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 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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