ch28

#!/bin/bash

# read-menu: amenu driven system information program

clear
echo "
Please Select:

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

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

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