Change swap file size

swapfile.sh

#!/bin/bash

change_swap() {
    read -rp "Size to change swap file to in whole number format e.g. 8 for 8GB >> " swap_file_size
    read -rp "Specify swapfile path/to/file >> " swap_file
    echo "Turning off swap for all swap files"
    if swapoff -a ; then 
        echo "Turning off swap successful. DD'ing $swap_file to size $swap_file_size"
        if dd if=/dev/zero of="$swap_file" bs=1G count="$swap_file_size" ; then
            echo "dd done, setting file permissions for swap"
            if chmod 600 "$swap_file" ; then
                echo "Permissions done, making new file part of swap"
                if mkswap "$swap_file" ; then
                    echo "Done, turning swap on for $swap_file"
                    if swapon "$swap_file" ; then
                        echo "Swap is now on. If not done already, add the following to /etc/fstab: "
                        echo "$swap_file none swap sw 0 0"
                    else
                        echo "Could not turn $swap_file on"
                        exit
                    fi
                else
                    echo "Could not mkswap $swap_file"
                    exit
                fi
            else
                echo "Could not chmod 600 $swap_file"
                exit
            fi
        else
            echo "Could not dd the swap file with count $swap_file_size bs=1G"
            exit
        fi
    else
        echo "Could not switch swapoff on $swap_file"
        exit
    fi

}

change_swap

I know this is a terrible script.