Terminal Arrow Keys Experiment

arrow-keys.sh

#!/bin/bash

ENTER=$(printf "%b" "\n")
ESCAPE=$(printf "%b" "\e")
UP_SUFFIX="A"
DOWN_SUFFIX="B"
RIGHT_SUFFIX="C"
LEFT_SUFFIX="D"

while true; do
	read -sn1 a
	case "$a" in
		$ENTER) echo "ENTER";;
		$ESCAPE)
			read -sn1 b
			test "$b" == "[" || continue
			read -sn1 b
			case "$b" in
				$UP_SUFFIX) echo "UP";;
				$DOWN_SUFFIX) echo "DOWN";;
				$LEFT_SUFFIX) echo "LEFT";;
				$RIGHT_SUFFIX) echo "RIGHT";;
				*) continue;;
			esac
		;;
		*) echo "$a";;
	esac
done