[client]
user=root
password=somepassword
...

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY

# ls -l /root/.mysqlpw
-rw------- 1 root root 7 2013-08-19 13:24 /root/.mysqlpw

# mysql -u root -p`cat /root/.mysqlpw ` yourdatabase < databasedump.sql

# mysql -u root -p`cat /root/.mysqlpw ` yourdatabase
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 20460
Server version: 5.1.63-0ubuntu0.10.04.1 (Ubuntu)

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| yourdatabase       |
+--------------------+
3 rows in set (0.00 sec)

mysql> show tables;
...