- A
find /home -type f -size +100M
Correct: `+100M` uses the valid M suffix (mebibytes) with the `+` for greater than, matching files larger than 100 MB.
- B
find /home -type f -size +100000000c
Why wrong: Incorrect: `+100000000c` matches files larger than 100,000,000 bytes, which is about 95.4 MB, not 100 MB.
- C
find /home -type f -size +100MB
Why wrong: Incorrect: `MB` is not a valid size suffix; find expects `M` for mebibytes or `k` for kibibytes.
- D
find /home -type f -size +102400k
Correct: `+102400k` matches files larger than 102,400 kilobytes, which is exactly 100 MB (since 100 × 1024 = 102,400).
- E
find /home -type f -size 100M
Why wrong: Incorrect: `-size 100M` matches files exactly 100 MB in size, not larger than 100 MB.
Question 418 of 513
LFCS Essential Commands Practice Question
This LFCS practice question tests your understanding of essential commands. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An administrator wants to find all files larger than 100MB in the /home directory. Which three commands or command sequences achieve this? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
find /home -type f -size +100M
Option A is correct because `-size +100M` matches files larger than 100 megabytes (where M stands for mebibytes, 1024*1024 bytes). Option D is correct because `-size +102400k` matches files larger than 100 megabytes (since 100*1024 = 102400 kilobytes). Option B is incorrect because `-size +100000000c` matches files larger than approximately 95.4 MB (100,000,000 bytes), not 100 MB. Option C is incorrect because `MB` is not a valid size suffix in find. Option E is incorrect because it omits the `+` sign, matching files exactly 100 MB rather than larger than 100 MB.
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.
- ✓
find /home -type f -size +100M
Why this is correct
Correct: `+100M` uses the valid M suffix (mebibytes) with the `+` for greater than, matching files larger than 100 MB.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
find /home -type f -size +100000000c
Why it's wrong here
Incorrect: `+100000000c` matches files larger than 100,000,000 bytes, which is about 95.4 MB, not 100 MB.
- ✗
find /home -type f -size +100MB
Why it's wrong here
Incorrect: `MB` is not a valid size suffix; find expects `M` for mebibytes or `k` for kibibytes.
- ✓
find /home -type f -size +102400k
Why this is correct
Correct: `+102400k` matches files larger than 102,400 kilobytes, which is exactly 100 MB (since 100 × 1024 = 102,400).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
find /home -type f -size 100M
Why it's wrong here
Incorrect: `-size 100M` matches files exactly 100 MB in size, not larger than 100 MB.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the valid `M` suffix with the invalid `MB` suffix, or forget that `+` is required for 'greater than' and mistakenly select the exact-match option.
Detailed technical explanation
How to think about this question
The `find` command's `-size` option uses suffixes like `c` (bytes), `k` (kibibytes), `M` (mebibytes), and `G` (gibibytes), all based on powers of 1024. The `+` prefix is a numeric comparison operator that means 'greater than', while no prefix means 'exactly equal to'. In real-world scenarios, administrators often combine `-size` with `-exec` or `-delete` to manage disk space, and understanding the exact suffix syntax is critical to avoid accidentally deleting or missing files.
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 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
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.
- →
Essential Commands — study guide chapter
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FAQ
Questions learners often ask
What does this LFCS question test?
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: find /home -type f -size +100M — Option A is correct because `-size +100M` matches files larger than 100 megabytes (where M stands for mebibytes, 1024*1024 bytes). Option D is correct because `-size +102400k` matches files larger than 100 megabytes (since 100*1024 = 102400 kilobytes). Option B is incorrect because `-size +100000000c` matches files larger than approximately 95.4 MB (100,000,000 bytes), not 100 MB. Option C is incorrect because `MB` is not a valid size suffix in find. Option E is incorrect because it omits the `+` sign, matching files exactly 100 MB rather than larger than 100 MB.
What should I do if I get this LFCS 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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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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