Quick Answer
The answer is /proc/[pid]/cmdline. This file stores the exact command-line arguments used to launch a process, with each argument separated by a null byte rather than a space, making it a reliable source for forensic investigators to reconstruct how an unknown binary was executed. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your understanding of the /proc filesystem as a live forensic artifact—trap answers often include /proc/[pid]/exe (which points to the binary itself) or /proc/[pid]/status (which shows process state but not arguments). When performing a Linux /proc cmdline process investigation, remember that reading this file with cat will display arguments concatenated without spaces, so using strings or tr to replace null bytes is essential for readability. A simple memory tip: “cmdline tells you the command line, not the command file.”
This CHFI practice question tests your understanding of os and network forensics. 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.
An analyst identifies an unknown binary running on a Linux server. Which /proc filesystem entry would provide the command-line arguments used to start the process?
/proc/[pid]/maps
Why wrong: Shows memory mappings.
/proc/[pid]/status
Why wrong: Contains process state, not command line.
/proc/[pid]/environ
Why wrong: Contains environment variables.
/proc/[pid]/cmdline
Contains the full command line of the process.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/proc/[pid]/cmdline
/proc/[pid]/cmdline contains the command-line arguments of the process, null-separated.
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.
/proc/[pid]/maps
Why it's wrong here
Shows memory mappings.
/proc/[pid]/status
Why it's wrong here
Contains process state, not command line.
/proc/[pid]/environ
Why it's wrong here
Contains environment variables.
/proc/[pid]/cmdline
Why this is correct
Contains the full command line of the process.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Shows memory mappings.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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 CHFI 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 CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
OS and Network Forensics — This question tests OS and Network Forensics — Read the scenario before looking for a memorised answer..
The correct answer is: /proc/[pid]/cmdline — /proc/[pid]/cmdline contains the command-line arguments of the process, null-separated.
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 21, 2026
This CHFI practice question is part of Courseiva's free EC-Council 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 CHFI exam.
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