An exercise in simple shell timer programming

ice-timer-script.sh

#!/bin/bash
while [ 1 ]; do
	HOUR=`date +%k`
	MIN=`date +%M`
	let REM="$MIN % 20"
	if [ $REM = 0 ]; then
		mocp -l beep-440-3s.ogg #a 440hz 3second ogg file
	fi
	let SET="($MIN-$REM)/20"
	echo -n "Hour: $HOUR Min: $MIN Set: $SET "
	let hrem="$HOUR % 2"
	if [ $SET -ne 1 ]; then
		if [ $hrem -ne 0 ]; then
			echo "Ice On"
		else
			echo "Ice Off"
		fi
	 else
		if [ $hrem -ne 0 ]; then
			echo "Ice Off"
		else
			echo "Ice On"
		fi
	fi
	sleep 60s #wait 1 minute
done