[root@zhifou ~]# mysql -u root -p
Enter password:********
******
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

mysql> SHOW DATABASES;
+----------+
| Database |
+----------+
| mysql    |
| test     |
+----------+
2 rows in set (0.13 sec)

[root@host]# mysqladmin -u root password "new_password";

[root@host]# mysqladmin --version
mysqladmin  Ver 8.0.19 for macos10.15 on x86_64 (MySQL Community Server - GPL)