This LPIC-1 practice question tests your understanding of shells, scripting and data management. 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 TWO of the following are required for a bash script to be executed by the shell (assuming the script is in the current directory)?
The script must have a shebang (#!) as the first line.
Required to specify interpreter.
The script must not contain any comments.
Why wrong: Comments are allowed.
The script must have a .sh extension.
Why wrong: Extension is not required.
The script must be in the PATH environment variable.
Why wrong: It can be run with ./ if not in PATH.
The script must have execute permission.
Without execute permission, the script cannot be run directly.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The script must have a shebang (#!) as the first line.
Option A is correct because the shebang (#!) as the first line of a bash script tells the kernel which interpreter to use (e.g., #!/bin/bash). Without it, the shell may attempt to execute the script using the default shell (often /bin/sh), which can lead to syntax errors or unexpected behavior. The shebang is essential for explicitly specifying the interpreter, especially when the script uses bash-specific features.
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.
The script must have a shebang (#!) as the first line.
Why this is correct
Required to specify interpreter.
Related concept
Read the scenario before looking for a memorised answer.
The script must not contain any comments.
Why it's wrong here
Comments are allowed.
The script must have a .sh extension.
Why it's wrong here
Extension is not required.
The script must be in the PATH environment variable.
Why it's wrong here
It can be run with ./ if not in PATH.
The script must have execute permission.
Why this is correct
Without execute permission, the script cannot be run directly.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
LPI often tests the misconception that a .sh extension is required for shell scripts, but Linux/Unix systems determine executability via the shebang and execute permission, not file extensions.
Detailed technical explanation
When a script is executed, the kernel reads the first two bytes (0x23 0x21) to detect the shebang, then invokes the specified interpreter with the script as an argument. If no shebang is present and the script is executed via ./script, the current shell (e.g., bash) will try to run it as a shell script, but this can fail if the script contains syntax incompatible with the calling shell. In real-world scenarios, omitting the shebang can cause scripts to break when run from cron or non-interactive shells that default to /bin/sh.
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
Shells, Scripting and Data Management — This question tests Shells, Scripting and Data Management — Read the scenario before looking for a memorised answer..
The correct answer is: The script must have a shebang (#!) as the first line. — Option A is correct because the shebang (#!) as the first line of a bash script tells the kernel which interpreter to use (e.g., #!/bin/bash). Without it, the shell may attempt to execute the script using the default shell (often /bin/sh), which can lead to syntax errors or unexpected behavior. The shebang is essential for explicitly specifying the interpreter, especially when the script uses bash-specific features.
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
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