#!/bin/bash

# case menu

clear
echo "Please select:
A. Display System Information
B. Display Disk Space
C. Display Home Space Utilization
Q. Quit"
read -p "Enter selection [A, B, C or Q] > "

case $REPLY in
  q|Q) echo "Program terminated."
       exit
       ;;
  a|A) echo "Hostname: $HOSTNAME"
       uptime
       ;;
  b|B) df -h
       ;;
  c|C) 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
       ;;
    *) echo "Invalid entry" >&2
       exit 1
       ;;
esac