menu_script_loop

#!/bin/bash

# while-menu: a menu driven system information program

DELAY=3 # Number of seconds to display results

while [[ $REPLY != 0 ]]; do
	clear
	cat <<- _EOF_
		Please Select:

		1. Display System Information
		2. Display Disk Space
		3. Display Home Space Utilization
		0. Quit
	_EOF_

	read -p "Enter selection [0-3] > "

	if [[ $REPLY =~ ^[0-3]$ ]]; then
		if [[ $REPLY == 1 ]]; then
			echo "Hostname: $HOSTNAME"
			uptime
			sleep $DELAY
		fi
		if [[ $REPLY == 2 ]]; then
                	df -h
                	sleep $DELAY
        	fi
		if [[ $REPLY == 3 ]]; then
			if [[ $(id -u) -eq 0 ]]; then
				echo "Home Space Utilization (All Users)"
				du -sh /home/*
			else
				echo "Home Space Utilization ($USER)"
				du -sh $HOME
			fi
			sleep $DELAY
		fi
	else
		echo "Invalid entry." >&2
		sleep $DELAY
	fi
done
echo "Program Terminated."