You have a Bash array arr=(1 2 3 4 5). You want to extract the last 3 elements using array slicing. Which command will do this correctly?

hard🚀 Application Q15 of 15

Bash Scripting - Arrays

You have a Bash array arr=(1 2 3 4 5). You want to extract the last 3 elements using array slicing. Which command will do this correctly?

A<code>echo ${arr[@]:-3}</code>

B<code>echo ${arr[@]: -3:3}</code>

C<code>echo ${arr[@]:3:3}</code>

D<code>echo ${arr[@]:3}</code>

Step-by-Step Solution

Solution:

Step 1: Understand negative index slicing in Bash
Using a negative start index slices from the end. ${arr[@]:-3} extracts from 3rd from end to the end (last 3 elements).
Step 2: Check each option
${arr[@]: -3:3} has space after : causing bad substitution. ${arr[@]:3:3} slices from index 3 length 3 but only 2 elements remain (4 5). ${arr[@]:3} slices from 3 to end (4 5). Only ${arr[@]:-3} gets exactly the last 3: 3 4 5.
Final Answer:
echo ${arr[@]:-3} -> Option A
Quick Check:
Negative start index slices from end [OK]

Quick Trick: Use negative start index without length to get last elements [OK]

Common Mistakes:

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