C.5.2.4. Client does not support authentication protocol

Error:

shell> mysql
Client does not support authentication protocol requested
by server; consider upgrading MySQL client

To solve this problem, you should use one of the following approaches:



Upgrade all client programs to use a 4.1.1 or newer client library.


When connecting to the server with a pre-4.1 client program, use an account that still has a pre-4.1-style password.


Reset the password to pre-4.1 style for each user that needs to use a pre-4.1 client program. This can be done using the SET PASSWORD statement and the OLD_PASSWORD() function:
mysql> SET PASSWORD FOR
    -> 'some_user'@'some_host' = OLD_PASSWORD('newpwd');


Alternatively, use UPDATE and FLUSH PRIVILEGES:
mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd')
    -> WHERE Host = 'some_host' AND User = 'some_user';
mysql> FLUSH PRIVILEGES;


Substitute the password you want to use for “newpwd” in the preceding examples. MySQL cannot tell you what the original password was, so you'll need to pick a new one.


Tell the server to use the older password hashing algorithm:



Start mysqld with the old_passwords system variable set to 1.


Assign an old-format password to each account that has had its password updated to the longer 4.1 format. You can identify these accounts with the following query:
mysql> SELECT Host, User, Password FROM mysql.user
    -> WHERE LENGTH(Password) > 16;


For each account record displayed by the query, use the Host and User values and assign a password using theOLD_PASSWORD() function and either SET PASSWORD or UPDATE, as described earlier.








Note

In older versions of PHP, the mysql extension does not support the authentication protocol in MySQL 4.1.1 and higher. This is true regardless of the PHP version being used. If you wish to use the mysql extension with MySQL 4.1 or newer, you may need to follow one of the options discussed above for configuring MySQL to work with old clients. The mysqli extension (stands for "MySQL, Improved"; added in PHP 5) is compatible with the improved password hashing employed in MySQL 4.1 and higher, and no special configuration of MySQL need be done to use this MySQL client library. For more information about the mysqli extension, see http://php.net/mysqli.


It may also be possible to compile the older mysql extension against the new MySQL client library. This is beyond the scope of this Manual; consult the PHP documentation for more information. You also be able to obtain assistance with these issues in our MySQL with PHP forum.
From: http://dev.mysql.com/doc/refman/5.0/en/old-client.html

Set up a svn server on linux quickly

Here is a quick guide for setting up a basic svn server on a linux platform. If you are looking for a detailed configuration, please refer to the manual of svn.

1. yum -y intall subversion  #install svn
2. svnadmin create /xx/svn_repository/plancky_code   #create a repository
3. cd /xx/svn_reposity/plancky_code and then modify server.conf, passwd   # add user and password
• vim server.conf and uncomment "password-db = passwd"
• vim passwd and add an item "username=password"
4. svnserve -d -r /xx/svn_repository/plancky_code   # start svn server
5. svn import /xx/plancky svn://localhost/plancky_code -m initial import --username username --password password  #import plancky to repository
6. svn co svn://localhost/plancky_code --username username --password password  #check out code from repository

• ERROR: If meeting Error"SVN: could not use external editor to fetch log message", we need to add a SVN_EDITOR to bash configuration
•       vim ~/.bash_profile
•       export SVN_EDITOR="/usr/bin/vim"
•       reopen the terminal to load the bash configuration

"Error : could not start the command" in TexMakerX

If you meet the error "Error : could not start the command" while executing TexMakerX commands in Win7 X64, it is probably due to environment path of LaTex compiler.  The following steps may help you solve this error.

1. Make sure that you did install a LaTex compiler like MiKTeX. You know,  TexMakerX is just a editor of latex input, not a compiler.
2. Locate the bin directory in the installation directory of the LaTex compiler.
3. Add the directory of bin like "d:\Program Files (x86)\MiKTeX 2.9\miktex\bin" to the environment paths of windows. 
• Right click computer in start menu, choose properties.
• Find the "Advanced system settings" in upper left corner.
• Click the button "Environment Variables".
• Find the row of variable path in the group of "System Variables" and add bin path like";d:\Program Files (x86)\MiKTeX 2.9\miktex\bin"to the tail. Remember to add a semicolon to separate different path. 

Then, try it again...