Bash Scripting - Quoting and Expansion
Which of the following is the preferred syntax for command substitution in bash?
Which of the following is the preferred syntax for command substitution in bash?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify valid command substitution syntax
Command substitution uses either backticks`command`or$(command). Both the backtick version and the incomplete$()version look valid at first.Step 2: Check for best practice and syntax correctness
echo `ls -l`uses backticks which are valid but less readable and harder to nest.echo $(ls -l)uses$()which is modern and preferred.echo $[ls -l]uses invalid syntax with$[].echo $(ls -lmisses closing parenthesis.Final Answer:
echo $(ls -l) -> Option DQuick Check:
Use $() for clear command substitution [OK]
Quick Trick: Use $() for command substitution, it's clearer and nestable [OK]
Common Mistakes:
MISTAKES- Using $[] which is arithmetic expansion, not command substitution
- Missing closing parenthesis
- Confusing backticks with other symbols
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