Once we install the MySQL in Linux operating system and we will get confused with which MySQL config file we have changed or configured during the MySQL setup
To get the exact config file that was used by MySQL, use the below information
mysqld --verbose --help | less
Or you can use the below method also, both are similar
$ which mysqld
/usr/sbin/mysqld
$ /usr/sbin/mysqld --verbose --help | grep -A 1 "Default options"
Default options are read from the following files in the given order:
/etc/mysql/my.cnf ~/.my.cnf /usr/etc/my.cnf