Error retreiving database name wordpress

I was trying the below code to retrieve database name from wordpress configuration file. But somehow a single inverted comma at the beginning is causing trouble.

db=`grep DB_NAME /var/www/vhosts/domain.com/httpdocs/wp-config.php | tr -d "(',);" | cut -d" " -f2`;
echo $db;
mysqldump -uadmin -p$(cat > /etc/psa.psa.shadow) $db > $db.sql

As given below it shows the output without any special characters but the below error shows an issue.

laysalaysa_laysalaysa

'" when selecting the databasencorrect database name 'laysalaysa_laysalaysa'

Answer

carriage return (r) caused the issue. Truncated it and script worked. But could not identify what cause the same.