XK0-006 Automation, Orchestration, and Scripting Practice Question
In a Bash script, what is the difference between single quotes and double quotes?
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
✓
Single quotes prevent variable expansion; double quotes allow it.
Single quotes preserve the literal value of each character, while double quotes allow variable expansion and command substitution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both behave the same.
Why it's wrong here
Single quotes suppress variable expansion, command substitution and backslash escaping, while double quotes permit all three, so the quoting styles differ materially. Treating them as identical is tempting when a script contains only literal text, where either quoting style produces the same output.
- ✗
Single quotes allow variable expansion; double quotes do not.
Why it's wrong here
Variable expansion occurs inside double quotes, not single quotes; single quotes treat the dollar sign literally. The reversed claim is tempting because single quotes do preserve text verbatim, which sounds like expansion until you test echo with a defined variable.
- ✗
Double quotes prevent all substitutions; single quotes allow command substitution.
Why it's wrong here
The behaviour is reversed: double quotes allow variable and command substitution, while single quotes suppress every substitution. This inversion is tempting because double quotes do protect against word splitting and globbing, which can be mistaken for preventing substitution entirely.
- ✓
Single quotes prevent variable expansion; double quotes allow it.
Why this is correct
Within single quotes, Bash treats every character literally, so $VAR stays unexpanded; double quotes permit parameter and command substitution while still suppressing word splitting and globbing. This satisfies the stem's request for the precise difference in expansion behaviour between the two quoting styles.
Go deeper
Related to this question
Key term
Value
Value is the perceived worth, benefit, or usefulness that a service, product, or activity delivers to stakeholders, especially customers and the business.
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
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