#!/bin/bash
##############################################################################
###                                                                        ###
###              Welcome to OPS235                                         ###
###                                                                        ###
###  Simple online tutorial welcoming students to OPS235 course,           ###
###  which discusses the layout of the course, as well as                  ###
###  how to prepare for the labs, and various "do's" and "don'ts".         ###
###                                                                        ###
### Author: Murray Edward Saul                                             ###
### Date: January, 2012                                                    ###
###                                                                        ###
##############################################################################

cd ~


function exitScript() {

  clear
  cat <<+
ATTENTION:

You have pressed the key combination
<CTRL><c> which has terminated this
program.

If you want to return to this welcome tutorial
you must run this program again....

+
read -p "$(echo -e "\e[0;32mPress <ENTER> to return to main WIKI\e[m")" null 
exit 1
}

trap exitScript 2


### Banner Advising User to Exit & Maximize Shell Window ###

clear
cat <<+
*********************************
*                               *
*  YOUR SSH WINDOW SHOULD       *
*  BE MAXIMIZED BEFORE USING    *
*  THIS TUTORIAL.               *
*                               *
*  $(echo -e "\e[0;32mPRESS <CTRL><C> TO ABORT\e[m")     *
*  $(echo -e "\e[0;32mPRESS <ENTER> TO CONTINUE\e[m")    *
*                               *
*********************************
+

### pause for user to press ENTER to continue ###

stty erase "^H"
read null

### Opening Banner (purpose & author) ###

clear
cat <<+
  WELCOME TO OPS235: Introduction to Open System Servers!                                                       
                                                                          
  The purpose of this simple online tutorial is to welcome students      
  to this course, how to use our resources, and how to prepare for      
  the next lab...

+

read -p "$(echo -e "\e[0;32mPress <ENTER> to continue or <CTRL><C> to exit\e[m")" null

					clear
					cat <<+
INTRODUCTION TO THE LINUX OS

Welcome to "Linux-UNIX Operating Systems"!

This introductory course provides the student with
essentials to create, run, maintain, and secure programs
and data within the Linux operating system.

Some sections of this tutorial provide information, while
other sections prompt the user to issue Linux commands.

+
read -p "$(echo -e "\e[0;32mPress <ENTER> to continue\e[m")" null
					clear
					cat <<+
WHY STUDY LINUX / UNIX?

Unfortunately, there have been many misconceptions regarding
the Linux and Unix operating systems over many years...

One common misconception is that Linux and Unix are only
Command Linux Interfaces (CLIs), which appear to be a
"backwards step" from more user-friendly operating systems
such as MS Windows or MAC computers, and other "hand-held"
devices.

Additional complaints arise from dealing with "unfriendly"
Linux/Unix experts when asked simple Linux questions from
new users (aka "Newbies").

+
read -p "$(echo -e "\e[0;32mPress <ENTER> to continue\e[m")" null
					clear
					cat <<+
When taking the time to objectively learn and use Linux/Unix,
many truths can eventually be realized:

  - Not only does Unix/Linux have a Graphical User Interface (GUI),
    but it can separate the GUI into levels (layers) that provide
    more flexibility. For example, specifying different window managers
    for window behaviour, and specify different Desktop Environments.

  - Since Unix evolved with ArpaNet (and later, the Internet), it was
    designed for networking (eg. TCP/IP transports). Linux obviously
    inherited these characteristics from Unix. Also, many utilities
    (commands) were created to take advantage of the Interent
    (eg. ssh, sftp, irc, web-servers, etc).

  - The Unix/Linux operating systems have been recognised for many years
    as a cost-effective and efficient platform developping software
    (porting developped software to other OS platforms).
 
+
read -p "$(echo -e "\e[0;32mPress <ENTER> to continue\e[m")" null
					clear
					cat <<+
BUILDING A COMMUNITY

Although user-friendly versions of Linux (such as Ubuntu) are
gaining popularity, Linux and Unix continue to be associated
as a "techie" operating system. The popularity of these types of
operating systems depend on "ease of use" and "ease of access to
help" to all users (both experts and "newbies").

Common areas of help for Linux continue to be "Web-page Resources", 
"man pages", "HOWTO" Resources, WIKIs, "IRC" chat lines, as well as e-mail
or web-based forums.
 
+
read -p "$(echo -e "\e[0;32mPress <ENTER> to continue\e[m")" null
					clear
					cat <<+
"COVERING ALL THE BASES"

Regardless of your operating system "preference", it is
beneficial for the IT professional to be proficient in
various operating systems.

For example, many computer systems combine different
operating systems to work together to integrate file systems,
printing resources and backup.

IT professionals that are proficient in MS Windows, Unix, and
Linux are greatly in demand (both in terms of pay levels 
and employment opportunities).
 
+
read -p "$(echo -e "\e[0;32mPress <ENTER> to continue\e[m")" null
					clear
					cat <<+
PURPOSE OF AN OPERATING SYSTEM

Regardless of the type of platform (MS Windows, MAC, Unix, Linux),
they all fullfill the same objectives:

    - Acts as an "extended machine" (i.e. Kernal controls hardware,
      contain commands (utilities) to allow user to interface
      with the operating system, and hence application software.

    - "Manage resources" such as Hardware / Input-Output devices
     (eg. hard drive / file systems, printers, terminal,
      and communication ports), processes and memory management.   

+
read -p "$(echo -e "\e[0;32mPress <ENTER> to continue\e[m")" null
					clear