This is reminder to myself (but if it’s usefull, then feel free).

Forgot the name of the database (Duh!)

mysql -u root -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 887
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 |
| billy_wordpress    |
| mysql              |
+--------------------+
3 rows in set (0.01 sec)

mysql> quit
Bye

Backup wordpress MySQL database

mysqldump -u root -p billy_wordpress > wordpress.sql

Encrypt using gpg for offsite storage, remember your not using your (or someone’s) public key to encrypt the file, your using a specific password so…

Hint: Keep a note of the password.

gpg -c wordpress.sql

The encryted file will have a gpg extension, so in my case it’s called “wordpress.sql.gpg”.

How to Decrypt the file

gpg wordpress.sql.gpg

Will give you 2 files, the original encrypted wordpress.sql.gpg file, and the unencryped wordpress.sql file.

References:
Encrypting and decrypting documents
Backup and Restore MySQL Databases