. /home/backupuser/db_credentials
user=$USERNAME
password=$PASSWORD
dbList=$(mysql -u$user -p$password -Bse "SHOW DATABASES")
for db in $dbList
do
   mysqldump –u$user -p$password --single-transaction --routines  $db > $dumpdir/${db}_${timestamp}.sql
   echo $db
done

mysqldump: Got error: 1045: Access denied for user 'root'@'localhost' (using password: YES) when trying to connect
db_1
mysqldump: Got error: 1045: Access denied for user 'root'@'localhost' (using password: YES) when trying to connect
db_2
mysqldump: Got error: 1045: Access denied for user 'root'@'localhost' (using password: YES) when trying to connect
db_3
mysqldump: Got error: 1045: Access denied for user 'root'@'localhost' (using password: YES) when trying to connect
...