Quick Answer
The correct answer includes both set -e and set -o pipefail, as these two directives together enforce strict error handling in a bash script. The set -e option, often called "exit on error," forces the script to terminate immediately whenever any command returns a non-zero exit status, preventing silent failures from cascading through subsequent logic. Meanwhile, set -o pipefail ensures that if any command within a pipeline fails, the entire pipeline’s exit status reflects that failure, rather than only the last command’s result—a common oversight that can mask critical errors in earlier stages. On the CompTIA Linux+ XK0-005 exam, this concept tests your understanding of script reliability and defensive programming, often appearing in scenario-based questions where an engineer must prevent undetected failures in automation. A common trap is assuming set -e alone is sufficient, but without pipefail, a pipeline like cmd1 | cmd2 could hide a failure in cmd1. To remember, think: "Exit early with -e, catch all pipes with pipefail."
This XK0-005 practice question tests your understanding of scripting, containers and automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Linux engineer needs to ensure a bash script runs with strict error handling. Which TWO of the following should be included? (Choose two.)
set -o pipefail
Exit on pipeline failure.
set -n
Why wrong: Syntax check only.
set -e
Exit on error.
set -x
Why wrong: Debugging, not error handling.
shopt -s histappend
Why wrong: History option.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
set -o pipefail
Option A, 'set -o pipefail', is correct because it ensures that if any command in a pipeline fails (returns a non-zero exit status), the entire pipeline's exit status reflects that failure. Without it, only the last command's exit status is considered, which can mask errors in earlier pipeline stages. Option C, 'set -e', is correct because it causes the script to exit immediately upon any command returning a non-zero exit status, preventing silent failures from propagating.
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.
set -o pipefail
Why this is correct
Exit on pipeline failure.
Related concept
Read the scenario before looking for a memorised answer.
set -n
Why it's wrong here
Syntax check only.
set -e
Why this is correct
Exit on error.
Related concept
Read the scenario before looking for a memorised answer.
set -x
Why it's wrong here
Debugging, not error handling.
shopt -s histappend
Why it's wrong here
History option.
Common exam traps
CompTIA often tests the distinction between debugging options (set -x) and error-handling options (set -e, set -o pipefail), leading candidates to mistakenly choose set -x as a strict error-handling mechanism.
Detailed technical explanation
Under the hood, 'set -e' (also known as errexit) causes the shell to call exit(2) when a command fails, but it has subtle exceptions: it does not trigger on failures in condition tests (e.g., if statements), commands in a pipeline after the last command (unless combined with pipefail), or commands negated with '!'. The 'set -o pipefail' option modifies the pipeline's exit status by setting it to the rightmost non-zero exit status of any command in the pipeline, which is critical in scripts that use pipes with commands like grep, awk, or sed where intermediate failures must not be ignored.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
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Scripting, Containers and Automation — study guide chapter
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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: set -o pipefail — Option A, 'set -o pipefail', is correct because it ensures that if any command in a pipeline fails (returns a non-zero exit status), the entire pipeline's exit status reflects that failure. Without it, only the last command's exit status is considered, which can mask errors in earlier pipeline stages. Option C, 'set -e', is correct because it causes the script to exit immediately upon any command returning a non-zero exit status, preventing silent failures from propagating.
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. A script uses 'set -e' and then calls a function that returns a non-zero exit status. The script exits unexpectedly. Which of the following should be added to the function to prevent the script from exiting?
mediumWhy B: The `set -e` directive causes the shell to exit immediately if any command returns a non-zero exit status. When a function called from such a script returns a non-zero status, the script exits. Adding `set +e` inside the function disables this behavior for the function's scope, allowing the function to handle errors internally without terminating the entire script.
Last reviewed: Jun 30, 2026
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