Plesk 12.x / Linux :: MySQL DB Backup Script Not Working

This is on a CentOS 7.1, Plesk 12. New.

On Plesk 10.4 I had a script that backed up my MySQL databases separately. The script doesn't work now. I get an error:

ERROR 1045 (28000): Access denied for user 'admin'@'localhost' (using password: YES)​

Do I need to do something different with this new "MariaDB" thing?

Here's the script:

DB_BACKUP="/pat/to/databackup/`date +%Y-%m-%d`"
DB_USER="admin"
DB_PASSWD="-p`cat /etc/psa/.psa.shadow`"
HN=`hostname | awk -F. '{print $1}'`

[Code] ....