In this example, passwordless authentication will be configured for root. If you want to reset root password, issue the following command.

mysqladmin -u root --password=abc123

Create root's hidden .my.cnf file.

touch /root/.my.cnf

Update root's hidden .my.cnf file so that only root and read/write the file.

chmod 0600 /root/.my.cnf

Append the following to root's hidden .my.cnf file.

[client]
password = abc123

You should now be able to connect ot mySQL / MariaDB as root without a password.

mysql -u root

Additionally, you will be able to issue mySQL commands on the command line with the -e option without providing root's password.

mysql -e "show databases;"