XK0-006 Automation, Orchestration, and Scripting Practice Question
In a Bash script, what is the purpose of the shebang '#!/bin/bash'?
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
✓
It specifies the path to the Bash executable that should run the script.
The shebang tells the system which interpreter to use to execute the script.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It specifies the path to the Bash executable that should run the script.
Why this is correct
The shebang's first line tells the kernel which interpreter binary executes the file, so `#!/bin/bash` names the absolute path to Bash. This satisfies the stem's requirement by ensuring the script runs under Bash rather than the invoking shell, regardless of the user's default login shell.
- ✗
It defines a variable for the Bash version.
Why it's wrong here
The shebang cannot define variables; it is parsed by the kernel to select the interpreter binary. Variable assignment happens inside the script body, so this would be correct only if the question asked how to store the Bash version, for example via BASH_VERSION.
- ✗
It sets the script's permissions to executable.
Why it's wrong here
The shebang names the interpreter that executes the script; it has no effect on file mode bits, which are changed with chmod. Setting execute permission is a separate, manual step, so this describes a filesystem operation rather than the kernel's interpreter selection.
- ✗
It enables debug mode for the script.
Why it's wrong here
The shebang line specifies the interpreter that executes the script, so it cannot toggle debug mode. Debugging is enabled by invoking Bash with the `-x` flag or running `set -x` inside the script. It is tempting because both involve script execution behaviour, but `set -x` is the correct mechanism when tracing command execution is required.
Go deeper
Related to this question
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.
Key term
Bash
Bash is a command-line interpreter that lets users interact with an operating system by typing text commands instead of clicking icons.
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