WARNING: my_print_defaults command not found.

在做mysql多实例的时候，启动MySQL，提示如下错误：

[root@localhost /]# /usr/local/mysql/bin/mysqld_multi  start 1
WARNING: my_print_defaults command not found.
Please make sure you have this command available and
in your path. The command is available from the latest
MySQL distribution.
ABORT: Can't find command 'my_print_defaults'.
This command is available from the latest MySQL
distribution. Please make sure you have the command
in your PATH.

原因是之前实验装了多个版本的MySQL，解决办法是输入如下命令：

[root@localhost /]# export PATH=/usr/local/mysql/bin:$PATH