Error 1045 (28000): Access denied for user 'root @ localhost' @ 'localhost' Solution

Error 1045 (28000): Access denied for user 'root @ localhost' @ 'localhost' Solution
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Blog, http://blog.csdn.net/shunqiziranhao007/article/details/8566783
Date, January 1, February 3, 2013
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$ Mysql-u root @ localhost-P
Enter password:
Error 1045 (28000): Access denied for user 'root @ localhost' @ 'localhost' (using password: Yes)
$ Mysql-H localhost-u root-P
Enter password:
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Your MySQL connection ID is 50
Server version: 5.5.29-0ubuntu0. 12.04.1 (UBUNTU)

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Mysql> show databases;
+ -------------------- +
| Database |
+ -------------------- +
| Information_schema |
| MySQL |
| Performance_schema |
| Test |
+ -------------------- +
4 rows in SET (0.00 Sec)