Bash Scripting - Quoting and Expansion
Which of the following is the correct syntax to multiply two variables
a and b using arithmetic expansion in bash?Which of the following is the correct syntax to multiply two variables a and b using arithmetic expansion in bash?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Recall arithmetic expansion syntax
Use$(( expression ))to evaluate math expressions.Step 2: Evaluate options
result=$((a * b)) correctly uses$((a * b)). result=$(a * b) uses command substitution, which is incorrect. result=$[a * b] uses deprecated syntax. result=a * b assigns a string.Final Answer:
result=$((a * b)) -> Option CQuick Check:
Correct multiplication syntax = result=$((a * b)) [OK]
Quick Trick: Use $(( )) to multiply variables, not $() or plain strings [OK]
Common Mistakes:
MISTAKES- Using $() instead of $(( ))
- Using deprecated $[] syntax
- Assigning math as string
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