Bash Scripting - Quoting and Expansion
Which of the following is the correct syntax to add two variables
a and b using arithmetic expansion in bash?Which of the following is the correct syntax to add two variables a and b using arithmetic expansion in bash?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct arithmetic expansion syntax
In bash, arithmetic expansion uses$((expression))to evaluate math expressions.Step 2: Check each option
sum=$((a + b)) uses$((a + b)), which is the correct syntax to add variables a and b.Final Answer:
sum=$((a + b)) -> Option AQuick Check:
Use $(( )) for math with variables [OK]
Quick Trick: Use $(( )) for math, not $[] or $() [OK]
Common Mistakes:
MISTAKES- Using $[] which is deprecated
- Using $() which is command substitution
- Using commas inside arithmetic expansion
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