Finding location of MySQL option file

[Yada Khov]

Is there a way to find the filename and path of the MySQL configuration file that was loaded on server startup?

From the ref manual the defaults are:

For Windows:

WINDIR\my.ini, WINDIR\my.cnf
C:\my.ini, C:\my.cnf
INSTALLDIR\my.ini, INSTALLDIR\my.cnf

For *nix:
/etc/my.cnf
/etc/mysql/my.cnf
SYSCONFDIR/my.cnf
$MYSQL_HOME/my.cnf
~/.my.cnf