Below is my Computeach UNIX assignment for Stage 4a, this assignment achived a 100% pass mark. Please note it uses some shell scripting methods not taught by Computeach.

Task One

A suitable directory hierarchy for the given application:-

Commands that could be used to create this directory structure:-

   cd /usr
   mkdir LM4792

   cd LM4792
   mkdir wp
   mkdir invoice
   mkdir sales-ledger
   mkdir stock-control

   cd wp
   mkdir managers
   mkdir staff
   mkdir general

Task Two

Below is a suitable shell script called mymenu to create the above menu system and accept a suitable response to activate each option or sub-menu. All responses are validated. Download this code.

#!/bin/sh

# A script to display a menu on the screen and accept only valid
# options from the user. - Mr Len Meakin - #**4792 - 22-12-2001

# Clear the screen of any previous output
clear

#Set choice to "" so loop continues looking for a correct response
choice=""
while [ "$choice" = "" ]; do
   echo " Computeach UNIX Menu Option system"
   echo " =================================="
   echo " Please choose an option from those listed below"
   echo ""
   echo ""

   echo " 1] Word Processing"
   echo " 2] Invoicing"
   echo " 3] Sales Ledger"
   echo " 4] Stock Control"
   echo " 5] Utilities..."
   echo " 6] Shutdown System"

   echo ""
   # -n option so input can be entered on the same line
   echo -n " Enter your choice [1-6] - "
   read choice

   echo ""
   # Check input and display what is about to happen
   case $choice in
      1) echo " Word Processing Selected" # OfficeStar
         ;;
      2) echo " Invoicing Selected"
         ;;
      3) echo " Sales Ledger Selected"
         ;;
      4) echo " Stock Control Selected"
         ;;
      5) echo " Entering Utilities Menu..."
         ;;
      6) echo " Attempting to shutdown the system..."
         ;;
      *) echo " Incorrect input '$choice', Please try again..."
         # Set choice to "" so loop continues
         choice=""
         # Display message for 2 seconds then continue asking
         sleep 2
         clear
         ;;
      esac
   done
echo "" # Blank line before returning back to the shell prompt
# End of script

Task Three

The following working groups need creating:-

   manger
   staff
   general

The commands required to create these working groups are as follows:-

   groupadd manager
   groupadd staff
   groupadd general

The following uses are to be added to the system:-

Set the correct permissions on the directories created in task one, with the following commands:-

   chown :manager /usr/LM4792/wp/managers
   chown :staff /usr/LM4792/wp/staff
   chown :general /usr/LM4792/wp/general

Prevent other users viewing the contents of the directories.

   chmod 770 /usr/LM4792/wp/managers
   chmod 770 /usr/LM4792/wp/staff
   chmod 770 /usr/LM4792/wp/general

Add the above users to the system.

useradd -g manager -G manager,staff,general -d /usr/home/bg -s /bin/bash -m -c "Bill Gates" bg
passwd bg
pop110smtp (entered twice when requested)

useradd -g staff -G staff,general -d /usr/home/fb -s /bin/bash -m -c "Fred Bloggs" fb
passwd fb
helo25box (entered twice when requested)

useradd -g staff -G staff,general -d /usr/home/ps -s /bin/bash -m -c "Pete Smith" ps
passwd ps
hal41goo (entered twice when requested)

useradd -g staff -G staff,general -d /usr/home/gm -s /bin/bash -m -c "Genny Moore" gm
passwd gm
thump28hit (entered twice when requested)

useradd -g staff -G staff,general -d /usr/home/pr -s /bin/bash -m -c "Phil Royle" pr
passwd pr
der45low (entered twice when requested)

useradd -g manager -G manager,staff,general -d /usr/home/lm -s /bin/bash -m -c "Len Meakin" lm
passwd lm
free22love (entered twice when requested)

Task Four

A suitable script that will backup all data files in the Sales Ledger directory could be as shown below. This script does assume that a default tape drive is already specified with in the file [ /etc/default/tar ]:-

#!/bin/sh

# A script for Computeach that backs up the /usr/LM4792/sales-ledger # directory to a
# pre-installed tape archiving system.
# This script is then to be called on a daily and weekly basis by # using crontab

tar -cv /usr/LM4792/sales-ledger

# End of script

Entry into crontab so that the /root/backup script is run on a daily and monthly basis:-

   crontab -e

Then within the vi editor:-
Press I to enter insert mode then enter the following line for the daily backup (1.00 am daily):-

   0 1 * * * /root/backup

Then enter the following line for the weekly backup (every Sunday at 2.00am):-

   0 2 * * 0 /root/backup

Then press [ESC] to quit insert mode.
Then enter :wq to save the file and exit out of vi.  

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