easyMultiple ChoiceObjective-mapped
XK0-006 Practice Question: A systems administrator writes a Bash script…
A systems administrator writes a Bash script named 'backup.sh' and wants it to run with the Bash shell. Which line should appear first in the script?
⚠ Common exam trap
CompTIA often tests the distinction between a shebang (`#!`) and a comment (`#`), and the trap here is that candidates may confuse `#!/bin/sh` as equivalent to `#!/bin/bash` or forget the exclamation mark entirely, leading them to choose option C or D.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
#!/bin/bash
The shebang line `#!/bin/bash` is required as the first line to instruct the operating system to execute the script using the Bash shell interpreter located at `/bin/bash`. Without this line, the script may be run by a different shell (e.g., `/bin/sh`), leading to syntax or behavior differences. The shebang must start with `#!` followed by the absolute path to the interpreter.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
# This is a bash script
Why it's wrong here
This is only a comment.
- ✓
#!/bin/bash
Why this is correct
Correct shebang for Bash.
- ✗
#/bin/bash
Why it's wrong here
Missing the exclamation mark.
- ✗
#!/bin/sh
Why it's wrong here
This uses the Bourne shell, not Bash.
Go deeper
Related to this question
Learn chapter
Process Management and System Monitoring
Key term
Operating system
An operating system (OS) is the core software that manages a computer's hardware and software resources, providing common services for computer programs.
Key term
Bash script
A Bash script is a text file containing a sequence of commands for the Unix shell Bash, allowing users to automate repetitive tasks and streamline system administration on Linux and macOS.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 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 XK0-006 exam.