You want to check if a variable input is either "yes" or "y" (case insensitive) using [[ ]]. Which snippet correctly does this?

hard🚀 Application Q15 of 15

Bash Scripting - Conditionals

You want to check if a variable input is either "yes" or "y" (case insensitive) using [[ ]]. Which snippet correctly does this?

A[[ $input =~ ^(yes|y)$ ]]

B[[ $input == "yes" || $input == "y" ]]

C[[ ${input,,} == "yes" || ${input,,} == "y" ]]

D[[ $input == "yes" && $input == "y" ]]

Step-by-Step Solution

Solution:

Step 1: Understand case-insensitive check
To ignore case, convert input to lowercase using ${input,,} before comparison.
Step 2: Check logical OR condition
We want to accept either "yes" or "y", so use || between comparisons.
Step 3: Evaluate options
[[ ${input,,} == "yes" || ${input,,} == "y" ]] correctly converts to lowercase and uses OR. [[ $input == "yes" || $input == "y" ]] lacks case conversion. [[ $input =~ ^(yes|y)$ ]] uses regex but is case-sensitive. [[ $input == "yes" && $input == "y" ]] uses AND which requires both to be true, impossible here.
Final Answer:
[[ ${input,,} == "yes" || ${input,,} == "y" ]] -> Option C
Quick Check:
Use ${var,,} for lowercase and || for OR [OK]

Quick Trick: Use ${var,,} to lowercase and || for OR in [[ ]] [OK]

Common Mistakes:

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