There you are :
[root@CTL1 tmp]# su - postgresql
su: user postgresql does not exist
[root@CTL1 tmp]# su - postgres
Last login: Thu Apr 26 12:25:01 CEST 2018 on pts/0
nodectl must be run as root!
nodectl must be run as root!
nodectl must be run as root!
nodectl must be run as root!
-bash-4.2$ psql
psql (9.2.23)
Saisissez « help » pour l'aide.
postgres=# \l
Liste des bases de données
Nom | Propriétaire | Encodage | Collationnement | Type caract. | Droits d'accès
----------------------+----------------------+----------+-----------------+--------------+-----------------------
dwh | postgres | UTF8 | fr_FR.UTF-8 | fr_FR.UTF-8 | =Tc/postgres +
| | | | | postgres=CTc/postgres
engine | engine | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
ovirt_engine_history | ovirt_engine_history | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
postgres | postgres | UTF8 | fr_FR.UTF-8 | fr_FR.UTF-8 |
template0 | postgres | UTF8 | fr_FR.UTF-8 | fr_FR.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | fr_FR.UTF-8 | fr_FR.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
(6 lignes)
postgres=#
Thanks