This LPIC-1 practice question tests your understanding of gnu and unix 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.
Which TWO commands can be used to display the contents of a compressed file without decompressing it to disk? (Choose two.)
zcat file.gz
Equivalent to gunzip -c; outputs to stdout.
gzip -d file.gz
Why wrong: gzip -d decompresses to a file (removes .gz) unless output is redirected.
tar -xzf file.tar.gz
Why wrong: tar -x extracts the archive to disk.
bzcat file.bz2
Outputs bzip2-compressed file to stdout.
uncompress file.Z
Why wrong: uncompress replaces the compressed file with the uncompressed version.
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 file.gz
A is correct because `zcat` reads a gzip-compressed file and writes its decompressed content to standard output without saving the decompressed data to disk. This allows you to view the contents of `file.gz` directly in the terminal or pipe it to other commands.
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.
zcat file.gz
Why this is correct
Equivalent to gunzip -c; outputs to stdout.
Related concept
Read the scenario before looking for a memorised answer.
gzip -d file.gz
Why it's wrong here
gzip -d decompresses to a file (removes .gz) unless output is redirected.
tar -xzf file.tar.gz
Why it's wrong here
tar -x extracts the archive to disk.
bzcat file.bz2
Why this is correct
Outputs bzip2-compressed file to stdout.
Related concept
Read the scenario before looking for a memorised answer.
uncompress file.Z
Why it's wrong here
uncompress replaces the compressed file with the uncompressed version.
Common exam traps
The trap here is that candidates confuse commands that decompress to stdout (like `zcat` and `bzcat`) with commands that decompress to disk (like `gzip -d` or `uncompress`), or they mistakenly think `tar -xzf` only displays the archive contents when it actually extracts them.
Trap categories for this question
Command / output trap
gzip -d decompresses to a file (removes .gz) unless output is redirected.
Detailed technical explanation
Both `zcat` and `bzcat` are essentially front-ends to `gzip -dc` and `bzip2 -dc` respectively, where the `-c` flag sends output to stdout. This is useful for piping compressed logs into `grep` or `less` without filling up disk space with temporary decompressed files. The `zcat` command is defined in the GNU gzip documentation and is a standard tool for viewing compressed text files in place.
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-1 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
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FAQ
GNU and Unix Commands — This question tests GNU and Unix Commands — Read the scenario before looking for a memorised answer..
The correct answer is: zcat file.gz — A is correct because `zcat` reads a gzip-compressed file and writes its decompressed content to standard output without saving the decompressed data to disk. This allows you to view the contents of `file.gz` directly in the terminal or pipe it to other commands.
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 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.
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