Address Book in Shell Script ~ Coding Atharva

Program:
#!/bin/bash
file_name="address-book.txt"

line()
{    
	printf "\n**********************************************\n";
}

sline()
{
	printf "\n################################################\n";
}

# Function to read address book
read_address_book()
{
    line

	echo "Address Book Contain: ";
	
	printf "\n Name \t MobileNo \t Location \n"
	echo "$(cat $file_name)";

	line
}

# Add Data into Address book
# Primary Key: Mobile Number
add_address_book()
{
    line 
    echo "Please Enter following Details: ";

    printf "\n Enter Name:"
    read name
	
	while true
	do
		printf "\n Enter Mobile Number:"
		read mobile_no
		
		pat="^[0-9]{10}$"
		while [[ ! $mobile_no =~ $pat ]]
			do
			print "\n Please enter correct phone number: "
			read mobile_no
		done
		
		grep $mobile_no $file_name
		
		RETURNSTATUS=`echo $?`

		if [ $RETURNSTATUS -eq 0 ]		
		then
			echo "Please Enter Another Number"
		else
			break
		fi

		unset RETURNSTATUS
		unset mobile_no
	done
	
    printf "\n Enter Location:"
    read location

    printf "$name \t $mobile_no \t $location \n"  >> $file_name 
    
	echo "Record Inserted Succeffully"
    line

	read_address_book
}

# To Read Single Record
read_single()
{
    line

    printf "\n Enter Mobile No:"
    read mobile_no

	grep $mobile_no $file_name
	
	RETURNSTATUS=`echo $?`

	if [ $RETURNSTATUS -eq 1 ]		
    then
		echo "No records found"
	else
		printf "\n\n Records:\n";
		echo "$(grep $mobile_no $file_name)"	
	fi
    line
}

# To Update Record in Address Book
update_address_book()
{
    line

    printf "\n Enter Mobile Number Search Key:"
    read search_key

    grep -n $search_key $file_name

	RETURNSTATUS=`echo $?`

	if [ $RETURNSTATUS -eq 1 ]		
    then
		echo "No records found for \"$search_key"\"
	else
		printf "\nEnter the line number (the first number of the entry) that you'd like to edit:"
		read lineNumber
		echo

		for line in `grep -n "$search_key" $file_name`
		do
			number=`echo "$line" | cut -c1` # cut -c1 = only take first column
			if [ $number -eq $lineNumber ]
			then
				printf "\n Enter Name:";
		        read name
                printf "\n Enter Location:";
                read location

                edit=`echo -e $name "\t" $search_key "\t $location"`
				
				lineChange="${lineNumber}s"
				
				sed -i -e "$lineChange/.*/$edit/" $file_name   
				
				echo "The change has been made."
			fi
		done 
    fi
    line
	read_address_book
}

# To Delete a Single Record
delete_record_address()
{
	line

	cat -n $file_name

	printf "\n Enter Record Number You Want to Delete:"
	read num

	sed -i -e $num"d" $file_name

	RETURNSTATUS=`echo $?`

	if [ $RETURNSTATUS -eq 1 ]		
    then
		echo "No Such Record Present"
	else
		echo "Record Deleted Successfuly"
	fi
	line
	read_address_book
}

# Main Program:

sline

# Checking File Present or Not
if [ -e $file_name ]
then
	printf "Address Book is Present \n";
else
	printf "Creating a New Address Book \n";
    ch=$(touch $file_name)
	RETURNSTATUS=$(echo $?)
	if [ $RETURNSTATUS -eq  0 ]
	then
		printf "\n New Address Book Created";
	else
		printf "\n Address Book Failed to Create";
	fi
fi

while true
do
	sline
    echo " Welcome to AddressBook: ";
	echo " Options: ";

	echo " 1) To View Address Book";
	echo " 2) To Add/Insert Address Record";
	echo " 3) To Read/View Single Record";
	echo " 4) To Update/Modify Record";
	echo " 5) To Delete a Record";
    echo " 6) Quit"; 

	printf " Enter a number: ";
	read num
	sline
	
	case $num in
		1) echo "You have selected Read Address Book"
			read_address_book;;
		2) echo "You have selected Add Data into Address Book:"
			add_address_book;;	
		3) echo "You have selected Read Single Record Option"
			read_single;; 
		4) echo "You have selected Update Record "
            update_address_book;;
        5) echo "You have selected Delete a Record "
			delete_record_address;;
		6) echo "Thanks For Using Address Book"
            break;;
        *) echo " Please Select Correct Option";;
	esac
	
	unset num	
done
Output:
Address Book in Shell Script

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