shell script respond to keypress

Question

I have a shell script that essentially says something like

while true; do
    read -r input
    if [\"$input\" = \"a\"]; then 
        echo \"hello world\"          


        

Answer 1

so the final working snippet is the following:

#!/bin/bash

while true; do
read -rsn1 input
if [ "$input" = "a" ]; then
    echo "hello world"
fi
done