The answer is `tar -tzf archive.tar.gz` and `zcat archive.tar.gz | tar -t`. Both commands allow you to list the contents of a tar.gz archive without extracting it because the `-t` flag tells tar to display the table of contents rather than performing an extraction, while `-z` handles the gzip decompression on the fly. The `zcat` approach achieves the same result by decompressing the file to standard output and piping it to `tar -t`, which reads the uncompressed stream directly. On the LPIC-1 exam, this tests your understanding of tar’s non-destructive listing mode and the common trap is assuming you must extract first or using `tar -x` instead of `-t`. A reliable memory tip is to think of the `-t` flag as “table of contents” — it shows you what’s inside without touching the disk.
LPIC-1 GNU and Unix Commands Practice Question
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 view the contents of a compressed file named archive.tar.gz without extracting it to disk?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
tar -tzf archive.tar.gz
Option C is correct because the `tar -tzf` command lists the contents of a tar archive compressed with gzip without extracting it. The `-t` flag tells tar to list the table of contents, `-z` handles the gzip decompression on the fly, and `-f` specifies the archive file. This is the standard, single-command method for viewing the contents of a `.tar.gz` file without writing any files to disk.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
gzip -d archive.tar.gz
Why it's wrong here
gzip -d decompresses, but does not list contents; it would produce archive.tar.
✗
bunzip2 -c archive.tar.gz | tar -t
Why it's wrong here
bunzip2 is for bzip2 compression; archive.tar.gz uses gzip.
✓
tar -tzf archive.tar.gz
Why this is correct
Correct: tar -t lists table of contents; -z handles gzip; -f specifies file.
Related concept
Read the scenario before looking for a memorised answer.
✗
gunzip -l archive.tar.gz
Why it's wrong here
gunzip -l shows compression info, not the file list of the tar archive.
✓
zcat archive.tar.gz | tar -t
Why this is correct
Correct: zcat decompresses to stdout; pipe to tar -t lists contents.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `gunzip -l` (which shows compression metadata) with listing the actual file contents, or they mistakenly apply bzip2 tools to gzip archives, forgetting that each compression format requires its own specific decompression utility.
Trap categories for this question
Command / output trap
gunzip -l shows compression info, not the file list of the tar archive.
Detailed technical explanation
How to think about this question
The `tar` command's `-z` option internally invokes a gzip decompression filter (using `libz`) before processing the archive stream, allowing it to read the tar header directly from the decompressed data. In contrast, `zcat` (or `gunzip -c`) decompresses to stdout, which can then be piped into `tar -t` to achieve the same result, as shown in option E. This two-step pipeline is useful when working with non-standard compression or when you need to inspect the archive without relying on tar's built-in decompression flags.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
GNU and Unix Commands — This question tests GNU and Unix Commands — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: tar -tzf archive.tar.gz — Option C is correct because the `tar -tzf` command lists the contents of a tar archive compressed with gzip without extracting it. The `-t` flag tells tar to list the table of contents, `-z` handles the gzip decompression on the fly, and `-f` specifies the archive file. This is the standard, single-command method for viewing the contents of a `.tar.gz` file without writing any files to disk.
What should I do if I get this LPIC-1 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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