Here are the scripts I wrote while studying the UNIX part of the Computeach 4250 project folder. They are all available for download if you have access to a UNIX system. Remember to chmod +x these scripts if you do download them. As usual these scripts are copyright to myself, so please do not use them as your own work.

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#!/bin/sh
#First script for Computeach
echo "Hello World, this is not my first script (not really)"
ls
# end of script

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#!/bin/sh
#Second script for Computeach, showing the read command.
echo -n "Please enter your first name - "
read first
echo -n "Please enter your surname - "
read surname
echo "$first $surname, Welcome to shell scripts"
#end of script

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#!/bin/sh
#Third shell script for Computeach, showing the use of command line args
echo "The command line arguments given to this script were - "
echo "$1 $2 $3 $4 $5 $5 $6 $7 $8 $9"
echo "Script name - $0"
#end of script

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#!/bin/sh
#Forth script for Computeach - Number of cmd args given to script
echo "Number of command line arguments given - $#"
#end of script

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#!/bin/sh
#Script 5 for Computeach - show the use of the shift command
echo "The first command line arg is $1, all args - $*"
shift
echo "The first command line arg is $1, all agrs - $*"
#end of script

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#!/bin/sh
#Script 6 for Computeach - if-fi statements
if (lpstat) then
	echo "OK"
else
	echo "NOT OK"
fi
#end of script

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#!/bin/sh
#Script 7 for Computeach - if-fi statements again
if (ls) then
	echo "OK"
else
	echo "NOT OK"
fi
#end of script

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#!/bin/sh
# status - Example script showing the use of the while loop.
#	   The script tests every 60 seconds to see if the given
#	   user is still logged on
# use is: status 
# Set up variable 'loginFlag' as a flag
loginFlag=1

while [ $loginFlag -eq 1 ]; do
	if ( who | grep -s $1 >/dev/null ) ; then
		sleep 60
	else
		loginFlag=0
	fi
done
#user has logged out
echo "$1 has logged out"
#end of script

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#!/bin/sh
# monthdays script for Computeach - display the number of days in the current month
month=`date +%m`
monthName=`date +%B`

case $month in
	1 | 3 | 5 | 7 | 8 | 10 | 12)
		days=31;
		;;
	4 | 6 | 9 | 11)
		days=30;
		;;
	2)
		year='date +%Y'
		#simple leap year test
		if ( `expr ($year % 4) == 0` ) then
			days=29;
		else
			days=28;
		fi
		;;
	*)
		#should never get here
		echo "Error in date utility"
		exit 1
		;;
esac
echo "The month of $monthName has $days days"
#end of script

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#!/bin/sh
# watch - Example script showing the use of the until loop.
#	  The script tests every 60 seconds to see if the 
#	  given user has logged in.
# use is: watch 
# Set up login flag
loginFlag=0

until [ $loginFlag -eq 1 ]; do
	if ( who -h | grep -s $1 >/dev/null ); then
		loginFlag=1
	else
		sleep 60
	fi
done
echo "$1 has logged in"
# end of script

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#!/bin/sh
#finduser script for Computeach.
#Check if the given user [users] is logged in.
if [ $# -ge 1 ]; then
	for user in $* ; do
		if (who -h | grep -s $user >/dev/null) then
			echo "$user is logged in"
		else
			echo "$user is not logged in"
		fi
	done
else
	echo "No user name given"
fi
#end of script

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#!/bin/sh
# Menu script for Computeach - show use of case statement
echo "MENU"
echo ""
echo "1. Display current system date"
echo "2. Display current working directory"
echo "3. Create a new directory"
echo ""

echo -n "Enter your choice - "
read choice
echo ""

case $choice in
	1)
		date
		;;
	2)
		pwd
		;;
	3)	
		echo -n "Directory name - "
		read dirName
		mkdir $dirName
		;;
	*)
		echo "Choice unknown"
		;;
esac
#end of script

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#!/bin/sh
# trash - A simple shell script that removes the given file
#	from it's current location into a directory named
#	/trashbin.
# usage -
#	trash -l - list all files in /trashbin
#	trash -x - extract the filename given from the /trashcan
#		   to the current directory (un-trash)
#	trash -e - removes all files from /trashbin (empty trash)

if [ $# -lt 1 ]; then
	echo ""
	echo "trash: usage is as follows:-"
	echo " trash  - moves filename given to the trashbin."
	echo " trash -l - List all files currently in trashbin."
	echo " trash -x - Extract the filename given from the trashbin"
	echo "            to the current directory."
	echo " trash -e - Remove all files from the trashbin."
	echo "" 
else
	case $1 in
		"-l")
			echo "Files currently in the trashbin are:-"
			ls -AFl /trashbin
			;;
		"-x")
			if [ "X$2" != "X" ]; then
				if [ ! -e "/trashbin/$2" ]; then
					echo "Error: trash: File '$2' not found in trashbin."
					exit 1
				fi
				echo "Extracting $2 from the trashbin to `pwd` ..."
				mv /trashbin/$2 ./ 
			else
				echo "Error: trash: No filename given."
				exit 1
			fi
			;;
		"-e")
			echo "Removing all files from the trashbin ..."
			rm -Ri /trashbin/*
			;;
		*)	
			if [ ! -e "$1" ]; then
				echo "Error: trash: File '$1' does not exist."
				exit 1
			else
				echo "Moving $1 to the trashbin ..."
				mv $1 /trashbin/$1
			fi
			;;
	esac
fi
# end of script 

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