Synopsis

my_print_defaults options filename

Use this to parse a configuration file so as to convert key/value pairs into command-line equivalent options. For instance, a line from the my.cnf file that reads basedir=/data/mysql will be converted to the --basedir=/data/mysql. To export the MySQL daemon (i.e., mysqld) section of my.cnf file, enter the following from the command line (the output follows):

my_print_defaults --config-file=/etc/my.cnf mysqld
--basedir=/data/mysql
--datadir=/data/mysql
--socket=/tmp/mysql.sock
--tmpdir=/tmp
--log-bin=/data/mysql/logs/log-bin

Notice that only the mysqld section is parsed and the header [mysqld] and the blank lines are not included in the output. Also, each key/value pair is printed on separate lines. To parse more than one section, you can list additional section names at the end of the command line, separated by spaces.