Quick Answer
The correct answer is that `set -x` displays each command before executing it, making it an essential tool for bash script debugging. This works because `set -x` enables a shell tracing mode that prints every command—after variable expansion and filename expansion—to standard error (stderr) just before the shell runs it, allowing you to see exactly what the script is doing step by step. On the CompTIA Linux+ XK0-005 exam, this command tests your understanding of shell execution flow and common debugging techniques; a frequent trap is confusing `set -x` with `set -v`, which prints raw lines before expansion, or forgetting that output goes to stderr, not stdout. To remember it, think of the "x" as standing for "execute trace"—it shows you the expanded command that will actually execute, not the original line.
This XK0-005 practice question tests your understanding of scripting, containers and automation. 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.
What does the `set -x` command do when placed at the top of a bash script?
Enables position parameters
Why wrong: Positional parameters are accessed via $1, $2, etc.; set -x does not affect them.
Exits the script on error
Why wrong: That is the function of set -e, not set -x.
Treats unset variables as errors
Why wrong: That is the behavior of set -u, not set -x.
Displays each command before executing it
Correct. set -x enables debugging output, printing commands and their arguments as they are executed.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Displays each command before executing it
Option D is correct because `set -x` enables a shell debugging mode that prints each command (after expansion) to stderr before executing it. This is commonly used in bash scripts to trace execution flow and debug complex logic.
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.
Enables position parameters
Why it's wrong here
Positional parameters are accessed via $1, $2, etc.; set -x does not affect them.
Exits the script on error
Why it's wrong here
That is the function of set -e, not set -x.
Treats unset variables as errors
Why it's wrong here
That is the behavior of set -u, not set -x.
Displays each command before executing it
Why this is correct
Correct. set -x enables debugging output, printing commands and their arguments as they are executed.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse `set -x` with `set -e` (exit on error) or `set -u` (treat unset variables as error), because all three are common debugging options but serve distinct purposes.
Detailed technical explanation
Under the hood, `set -x` sets the `-x` shell option, which causes the shell to write a trace of each command (prefixed with `+ `) to stderr after parameter expansion but before execution. This is particularly useful in CI/CD pipelines or complex scripts where you need to see the actual values being passed to commands, as it reveals how variables and globs expand before execution.
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 XK0-005 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
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FAQ
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: Displays each command before executing it — Option D is correct because `set -x` enables a shell debugging mode that prints each command (after expansion) to stderr before executing it. This is commonly used in bash scripts to trace execution flow and debug complex logic.
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.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are valid methods for debugging a Bash script? (Choose TWO.)
easyWhy B: Using 'bash -x script.sh' prints commands and arguments. Adding 'set -x' inside the script enables tracing. Option B is invalid option. Option D is for checking syntax only. Option E runs script in restricted mode, not debug.
Last reviewed: Jun 25, 2026
This XK0-005 practice question is part of Courseiva's free CompTIA 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 XK0-005 exam.
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