Quick Answer
The answer is `#!/usr/bin/env python3` because this shebang uses the `env` utility to locate the `python3` interpreter by searching the user's `PATH`, rather than hardcoding an absolute path like `/usr/bin/python3`. This approach ensures maximum portability across Unix-like systems, as Python 3 may reside in different directories—such as `/usr/local/bin/python3` or `/opt/python3/bin/python3`—depending on the distribution or installation method. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of script portability and the `env` command’s role in resolving interpreter locations; a common trap is choosing a shebang with a fixed path, which would break on systems where Python 3 is installed elsewhere. Remember the mnemonic “env finds everywhere” to recall that `env` dynamically locates the interpreter, making your script truly portable.
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.
Which shebang ensures maximum portability across systems for a Python script?
#!/usr/bin/env python3
env uses PATH to locate python3, making it portable across different systems.
#!/bin/python
Why wrong: Hardcoded path may not exist on all systems.
#!/usr/bin/python
Why wrong: Hardcoded path may not exist; Python3 might be at a different location.
#!/usr/local/bin/python3
Why wrong: Hardcoded path may not exist in default installations.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
#!/usr/bin/env python3
Option A is correct because `#!/usr/bin/env python3` uses the `env` utility to locate the `python3` interpreter in the user's `PATH`, making the script portable across different Unix-like systems where Python 3 may be installed in various directories (e.g., `/usr/bin/python3`, `/usr/local/bin/python3`). This shebang avoids hardcoding an absolute path, which is the key to maximum portability.
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.
#!/usr/bin/env python3
Why this is correct
env uses PATH to locate python3, making it portable across different systems.
Related concept
Read the scenario before looking for a memorised answer.
#!/bin/python
Why it's wrong here
Hardcoded path may not exist on all systems.
#!/usr/bin/python
Why it's wrong here
Hardcoded path may not exist; Python3 might be at a different location.
#!/usr/local/bin/python3
Why it's wrong here
Hardcoded path may not exist in default installations.
Common exam traps
CompTIA often tests the misconception that hardcoding a common path like `/usr/bin/python` is safe, but the trap is that this path may point to Python 2 on many systems, while the question explicitly requires Python 3 and maximum portability.
Detailed technical explanation
The `env` command searches the `PATH` environment variable for the first occurrence of `python3`, which allows the script to work across systems where Python 3 is installed in non-standard locations (e.g., `/opt/python3/bin/python3` or a virtual environment). However, note that `env` itself must be at `/usr/bin/env` (per POSIX), and this shebang can fail if the script is run in a restricted environment where `PATH` is not set or `env` is missing, though such cases are rare in typical Linux administration.
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
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: #!/usr/bin/env python3 — Option A is correct because `#!/usr/bin/env python3` uses the `env` utility to locate the `python3` interpreter in the user's `PATH`, making the script portable across different Unix-like systems where Python 3 may be installed in various directories (e.g., `/usr/bin/python3`, `/usr/local/bin/python3`). This shebang avoids hardcoding an absolute path, which is the key to maximum portability.
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.
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Last reviewed: Jun 30, 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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