Convert text to Uppercase & Lowercase

Convert text to Uppercase & Lowercase

#!/bin/bash

echo -n "Enter File Name : "
read fileName

if [ ! -f $fileName ]; then
	echo "Filename $fileName does not exists"
	exit 1
fi
GREEN='\033[1;32m'
UpLow='Choose Conversion Type: '
choiceul=("From Lowercase to Uppercase" "From Uppercase to Lowercase")
select fav in "${choiceul[@]}"; do
    case $fav in
        "From Lowercase to Uppercase")
			tr '[a-z]' '[A-Z]' <$fileName >Uppercase.txt
			echo -e "Text in File Converted From Lowercase to Uppercase, Check ${GREEN}Uppercase.txt"

	    break;;
        "From Uppercase to Lowercase")
			tr '[A-Z]' '[a-z]' <$fileName >Lowercase.txt
			echo -e "Text in File Converted From Lowercase to Uppercase, Check ${GREEN}Lowercase.txt"

	    break;;
	"Quit")
	    echo "User requested exit"
	    exit;;
        *) echo "invalid option $REPLY";;
    esac
done