~# apt-get install 

Le programme d'installation demande le mot de passe de l'utilisateur root.

~# mysql -u root -pazerty mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 47
Server version: 5.5.44-0+deb8u1 (Debian)
 
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
 
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
mysql> select host,user from user;
+-----------------+------------------+
| host            | user             |
+-----------------+------------------+
| 127.0.0.1       | root             |
| ::1             | root             |
| localhost       | debian-sys-maint |
| localhost       | root             |
+-----------------+------------------+
4 rows in set (0.00 sec)
 
mysql> quit
Bye
~# 

Noter l'absence de blanc entre -p et le mot de passe.

“mysql” est le nom de la base de données interne à mySQL.