Quick Answer
The answer is `less`, along with `cat` and `more`, as the three standard commands to view file contents in Linux. `cat` reads and outputs the entire file sequentially to the terminal, making it ideal for short files, while `less` and `more` allow paged navigation through longer outputs, with `less` offering backward scrolling and search capabilities. On the Linux Foundation Certified System Administrator LFCS exam, this tests your understanding of fundamental file manipulation and text processing utilities, often appearing in performance-based tasks where you must efficiently inspect configuration or log files. A common trap is assuming `cat` is always the best choice—it can overwhelm your terminal with large files, whereas `less` is safer for lengthy content. Another pitfall is confusing `head` or `tail` (which show only portions) with full-file viewers. For a memory tip, remember the mnemonic "Cats Love Mice" to recall the trio: `cat`, `less`, and `more` are the primary commands for viewing file contents.
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.
Which THREE commands can be used to view the contents of a file?
grep
Why wrong: Searches for patterns, not for viewing entire file.
find
Why wrong: Searches for files, does not display contents.
cat
Concatenates and displays file contents.
head
Displays the first few lines of a file.
less
Displays file contents page by page.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
cat
The `cat` command (option C) is a standard Unix utility that reads files sequentially and outputs their contents to the standard output. It is one of the most basic and direct ways to view the entire content of a file in the terminal.
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.
grep
Why it's wrong here
Searches for patterns, not for viewing entire file.
find
Why it's wrong here
Searches for files, does not display contents.
cat
Why this is correct
Concatenates and displays file contents.
Related concept
Read the scenario before looking for a memorised answer.
head
Why this is correct
Displays the first few lines of a file.
Related concept
Read the scenario before looking for a memorised answer.
less
Why this is correct
Displays file contents page by page.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse `grep` (which can display matching lines) with a file-viewing command, or think `find` can show file contents because it locates files, but neither is designed for that purpose.
Detailed technical explanation
Under the hood, `cat` uses the `read()` system call to read data from the file descriptor in blocks (typically 8192 bytes) and writes them to stdout via `write()`. A subtle behavior is that `cat` can concatenate multiple files (e.g., `cat file1 file2`), and if no file is specified, it reads from stdin, which can lead to unexpected hanging in scripts if not handled properly.
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
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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: cat — The `cat` command (option C) is a standard Unix utility that reads files sequentially and outputs their contents to the standard output. It is one of the most basic and direct ways to view the entire content of a file in the terminal.
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 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.
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