The answer is the PATH environment variable being different between cron and interactive sessions. When a cron job runs, it executes with a minimal environment, typically inheriting only a limited PATH such as /usr/bin:/bin, so if 'myapp' resides in a directory like /usr/local/bin, it simply won't be found. In contrast, when the same user runs the script manually, their interactive shell sources profile files like .bash_profile or .bashrc, which set a more complete PATH that includes that directory. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of cron’s non-interactive shell behavior and the common trap of assuming the environment matches your login shell. A frequent memory tip is to always use absolute paths or explicitly set PATH at the top of cron scripts to avoid this exact failure. Remember: cron’s PATH is sparse, not your interactive one.
XK0-005 Troubleshooting Practice Question
This XK0-005 practice question tests your understanding of troubleshooting. 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 cron job runs a script that fails because the command 'myapp' is not found. The script works when run manually by the same user. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The PATH environment variable is different
When a cron job runs, it executes with a minimal environment, typically inheriting only a limited PATH (often just /usr/bin:/bin). The 'myapp' command is not found because its location (e.g., /usr/local/bin) is not in cron's PATH. When the same user runs the script manually, their interactive shell sources profile files (like .bash_profile or .bashrc) that set a more complete PATH, including the directory containing 'myapp'. This discrepancy is the most common cause of such failures.
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.
✗
The user does not have a home directory
Why it's wrong here
A missing home directory would affect environment but not directly PATH.
✗
The cron daemon is not running
Why it's wrong here
If the cron daemon were not running, no jobs would execute.
✗
The script has syntax errors
Why it's wrong here
If the script worked manually, syntax is not the issue.
✓
The PATH environment variable is different
Why this is correct
Cron uses a restricted PATH; the full path to 'myapp' should be specified in the crontab or script.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume the script has a syntax error or that the cron daemon is failing, when the real issue is the stripped-down environment (especially PATH) that cron provides, which differs from the interactive shell environment.
Detailed technical explanation
How to think about this question
Cron jobs run in a non-interactive, non-login shell, which does not source user-specific initialization files like .bash_profile or .bashrc. The default PATH for cron is often set in /etc/crontab or defined by the cron daemon itself (e.g., PATH=/usr/bin:/bin). This means commands installed in /usr/local/bin, /opt, or custom user directories are not found unless explicitly set within the script or crontab. A common fix is to define a full PATH at the top of the crontab file or within the script itself.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The PATH environment variable is different — When a cron job runs, it executes with a minimal environment, typically inheriting only a limited PATH (often just /usr/bin:/bin). The 'myapp' command is not found because its location (e.g., /usr/local/bin) is not in cron's PATH. When the same user runs the script manually, their interactive shell sources profile files (like .bash_profile or .bashrc) that set a more complete PATH, including the directory containing 'myapp'. This discrepancy is the most common cause of such failures.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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 user runs a command and receives the error 'bash: myapp: command not found'. The administrator confirms the binary exists in /usr/local/bin. Which environment variable should be checked?
easy
✓ A.HOME
B.SHELL
C.LD_LIBRARY_PATH
D.PATH
Why A: The PATH environment variable defines the directories the shell searches for executables when a command is typed. Even though the binary exists in /usr/local/bin, if that directory is not listed in PATH, the shell will not find it and will return 'command not found'. Checking and correcting PATH resolves this issue.
Last reviewed: Jun 25, 2026
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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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