Shell script to rename/move a file after it is downloaded

file_rename.sh

#!/bin/bash

echo "1. Rename file1.zip -> file2.zip"
echo "2. Move file1.tar.gz -> file2.tar.gz"
echo "3. Exit"
echo "Please enter your choice: "
read option

#The base folder path
basePath="/home/mad"

case $option in
    1)
        originalFile="$basePath/downloads/file1.zip"
        renameFile="$basePath/downloads/file2.zip"
        ;;

    2)
        originalFile="$basePath/downloads/file1.tar.gz"
        renameFile="$basePath/archives/file2.tar.gz"
        ;;
    3)
        exit 0
        ;;
esac

if ! [ -f "$originalFile" ]
then
    echo "$originalFile does not exist"
    exit 1
else
    echo "$originalFile found.."
fi


while : 
do
    if ! [[ `lsof $originalFile` ]]
    then
        echo "$originalFile -> $renameFile"
        mv $originalFile $renameFile
        break
    else
        echo "file in use. waiting.."
    fi
    sleep 5
done
echo "Done!"