while-menu.sh

#!/bin/bash
# while-menu: a menu driven system information program
DELAY=1 # 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."
        sleep $DELAY
    fi
done
echo "Program terminated."