XK0-006 Automation, Orchestration, and Scripting Practice Question
In bash, 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.
- ✓
Single quotes prevent variable expansion, double quotes allow it.
Why this is correct
Single quotes treat every character literally, so a variable such as $HOME is passed unchanged, whereas double quotes permit parameter and variable expansion, command substitution and escape sequences. This quoting distinction determines whether the shell interprets the enclosed text before passing it to the command.
- ✗
Both allow variable expansion, but double quotes also allow globbing.
Why it's wrong here
Globbing (pathname expansion) is suppressed by double quotes, not enabled by them, so the stated mechanism is backwards. Both quoting styles do prevent word splitting and glob expansion; the genuine axis is variable, command and arithmetic expansion, which double quotes permit and single quotes block.
- ✗
Single quotes allow variable expansion, double quotes do not.
Why it's wrong here
Single quotes suppress expansion entirely, so this reverses bash's actual behaviour; the stem asks which quoting form permits expansion, and only double quotes do. It tempts candidates who confuse the two, since single quotes are commonly described as 'literal' without clarifying that literality means no variable substitution occurs.
- ✗
There is no difference; they are interchangeable.
Why it's wrong here
Single quotes suppress all expansion, while double quotes still allow variable, command and arithmetic expansion — they are not interchangeable. It is tempting because both group text and prevent word splitting, but any script relying on $VAR or $(command) behaves differently under each quoting style.
Go deeper
Related to this question
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.
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.
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