确定MySQL在Linux系统中配置文件的位置

1.通过which mysql命令来查看mysql的安装位置。
如确定位于/usr/local/mysql/bin

2.通过/usr/local/mysql/bin/mysqld --verbose --help |grep -A 1 'Default options'命令来查看mysql使用的配置文件默认路径。
可能看到如下信息：
2019-04-14 19:18:23 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled
2019-04-14 19:18:23 0 [Note] mysqld (mysqld 5.6.42) starting as process 14944 ...
2019-04-14 19:18:23 14944 [Note] Plugin 'FEDERATED' is disabled.
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf
2019-04-14 19:18:23 14944 [Note] Binlog end
2019-04-14 19:18:23 14944 [Note] Shutting down plugin 'MyISAM'
2019-04-14 19:18:23 14944 [Note] Shutting down plugin 'CSV'