--help Displays a brief operation introduction.
--print-defaults Displays default values for options; default values can come
from configuration files or system variables.
--nodefaults Causes no configuration files to be read at startup.
--defaults-file=filename Causes only this configuration file to be read at startup.
--defaults-extra-file=filename First the global configuration file is read, and then filename,
and finally (only under Unix/Linux), the user-specific configuration file.
--port=n Specifies the TCP/IP port over which communication takes place (usually 3306).
--socket=filename Specifies which socket file should be used for local communication
between client and server (only under Unix/Linux;
by default usually /var/lib/mysql/mysql.sock). If named pipes
are used under Windows, then socket specifies the name of the
named pipe (by default MySQL).
--version Displays the version number of the program.