What is the output of this script?

medium📝 Command Output Q4 of 15

Bash Scripting - Loops

for num in 1 2 3; do echo $((num * 2)); done

A2 4 6

B2\n4\n6

Cnum * 2 num * 2 num * 2

DError: invalid arithmetic

Step-by-Step Solution

Solution:

Step 1: Understand arithmetic expansion
$((num * 2)) calculates num times 2 for each loop iteration.
Step 2: Determine output format
echo prints each result on a new line, so output is 2, then 4, then 6 each on its own line.
Final Answer:
2\n4\n6 -> Option B
Quick Check:
Arithmetic expansion outputs doubled numbers line by line [OK]

Quick Trick: Use $(( )) for arithmetic inside loops [OK]

Common Mistakes:

MISTAKES

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