This LFCS practice question tests your understanding of essential commands. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 process is consuming 99% CPU and is unresponsive to normal shutdown requests. After running 'top', you see the PID is 1234. What is the most appropriate command to stop the process gracefully first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
kill -15 1234
SIGTERM is the default and polite way to terminate a process.
kill -19 1234
Why wrong: SIGSTOP suspends the process; it does not terminate it.
kill -2 1234
Why wrong: SIGINT is intended for interactive processes and may be ignored by background processes.
kill -9 1234
Why wrong: SIGKILL forcefully kills the process without cleanup, which can lead to data loss or corruption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kill -15 1234
The correct answer is A: kill -15 1234. The SIGTERM signal (15) is the standard way to request a process terminate gracefully, allowing it to clean up resources, close files, and perform shutdown routines. This is the most appropriate first step before escalating to stronger signals, as it gives the process a chance to exit normally.
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.
kill -15 1234
Why this is correct
SIGTERM is the default and polite way to terminate a process.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
kill -19 1234
Why it's wrong here
SIGSTOP suspends the process; it does not terminate it.
kill -2 1234
Why it's wrong here
SIGINT is intended for interactive processes and may be ignored by background processes.
kill -9 1234
Why it's wrong here
SIGKILL forcefully kills the process without cleanup, which can lead to data loss or corruption.
Common exam traps
The trap here is that candidates often jump to kill -9 (SIGKILL) as the first solution when a process is unresponsive, but the LFCS exam emphasizes the principle of escalating signals gracefully, starting with SIGTERM.
Detailed technical explanation
Under the hood, SIGTERM (signal 15) is the default signal sent by the kill command if no signal is specified. It is designed to be catchable and handled by the process, allowing it to execute cleanup handlers (e.g., closing database connections, flushing buffers). In contrast, SIGKILL (signal 9) cannot be caught or ignored, causing an immediate termination that can lead to data corruption or resource leaks. In real-world scenarios, such as a runaway web server or database process, using SIGTERM first is critical to maintain data integrity.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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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: kill -15 1234 — The correct answer is A: kill -15 1234. The SIGTERM signal (15) is the standard way to request a process terminate gracefully, allowing it to clean up resources, close files, and perform shutdown routines. This is the most appropriate first step before escalating to stronger signals, as it gives the process a chance to exit normally.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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