message: remove another += use.
diff: @@ -76,7 +76,7 @@ function echo_status(){
  function backup_database(){
  backup_file="$BACKUP_DIR/$TIMESTAMP.$database.sql.gz"
  - output+="$database => $backup_file\n"
  + output="${output}${database} => $backup_file\n"
  echo_status "...backing up $count of $total databases: $database"
  $(mysqldump $(mysql_login) $database | gzip -9 > $backup_file)
  }
  