Shell Programming and Scripting

#!/bin/sh


echo "Welcome To My Phone Book.\n\n"
sleep 2
clear


function main
{
	while : ; do
		echo "1) Add Phone Number\n2) Add Address\n3) Make a new Phone Book.\n4) Exit\n\n"
		echo "Enter: "
		read choice
		
		case $choice in
			1) select1;;
			2) select2;;
			3) select3;;
			4) close;;
		esac
	done
}


function select1
{
    echo "Please Enter the Name: "
    read Name
    echo "Enter the Phone Number: "
    read Number
    echo "Adding To Phone Book..\n"
    sleep 1
    
       	echo "Added Information.\n"
    	echo "==============================================\n\n" >> phone1.log
    	echo "Name: $Name \n" >>phone1.log
    	echo "Phone Number: $Number\n" >> phone1.log
    	echo "==============================================\n\n" >> phone1.log
    	sleep 2
    	return
}

function select2
{
	echo"Please Enter the Name: "
    	read Name2 
    	echo "Enter the House Number: "
    	read HouseNumber 
    	echo "Enter the Phone Number: "
    	read PhoneNumber2 
    	echo "Enter the Town/City: "
    	read TownCity 
    	
    		echo "+=========================================+\n" >> phone1.log
    		echo "Name: $Name2 \n" >> phone1.log
    		echo "House Number: $HouseNumber \n" >> phone1.log
    		echo "Phone Number: $PhoneNumber2 \n" >> phone1.log
    		echo "Town/City: $TownCity \n\n" >> phone1.log
    		echo "+=========================================+\n\n" >> phone1.log
    		
    	
    	echo "Adding Information..\n"
    	sleep 1
    	echo "Information Added.\n"
    	sleep 1
    	return
}

function select3
{
	echo"You only need to Make this once..\n"
    	echo "" >> phone1.log
	return
}

function close
{
	echo "Exiting..\n"
    	sleep 1
    	exit
}

# we can invoke a function only after we defined it.
main