Create Disks in linux with Bash Script

#!/bin/bash

echo "Welcome"
sleep 2
echo "how many pv do you want to create?"
read pv
for(( i=1; i<=$pv; i++ ))
do
        echo "type the name of disc number $i that you want to make pv"
        read disc
        pvcreate /dev/$disc
done
echo "type a name of the VG"
read vg
vgcreate $vg `pvdisplay | grep "PV Name" | awk ' {print $3 }' | tr '\n' ' '`
echo "how lvm do you want to create?"
read lvm
for(( i=1; i<=$lvm; i++ ))
do
        echo "type the name of lvm number $i that you want to create"
        read name_lvm
        echo "type the size of the lvm"
        read size_lvm
        echo "which file system do you want to create (xfs,swap,ext4..)?"
        read file_system
        lvcreate --name $name_lvm --size $size_lvm $vg
	if [ "$file_system" != "swap" ]
	then
        	mkfs.$file_system /dev/mapper/$vg-$name_lvm
			echo "would you like do mount for the lvm?"
			read mount
			if [ "$mount" = "y" ] || [ "$mount" = "yes" ]
			then
                echo "enter the folder for the mount"
                read folder
                if [ ! -d "/$folder" ]
                then
                        echo "the folder that you choose is not exist, do you want to create this folder?"
                        read answer_folder
                        if [ "$answer_folder" = "y" ] || [ "$answer_folder" = "yes" ]
                        then
                                mkdir /$folder
                        elif  [ "$answer_folder" = "n" ] || [ "$answer_folder" = "no" ]
                        then
                                echo "OK"
                                break
                        else
                                echo "wrong answer"
                                break
                        fi
				fi		
                if [ -d "/$folder" ]
                then
                        echo "/dev/mapper/$vg-$name_lvm/     /$folder           $file_system    defaults    0 0" >> /etc/fstab
                        mount /dev/mapper/$vg-$name_lvm/ /$folder
                        echo -e "mount done and write in fstab file \ndone"
                else
                        echo "the mount is cacneld"
				fi
			fi	
	elif [ "$file_system" = "swap" ]
	then
		swapoff -a
		mkswap /dev/mapper/$vg-$name_lvm
		swapon /dev/mapper/$vg-$name_lvm
		echo "/dev/mapper/$vg-$name_lvm/     swap          swap    0 0" >> /etc/fstab
    fi
	
			   
done