[oracle@oracle ~]$ ps -ef|grep pmon
grid 3135 1 0 20:03 ? 00:00:00 asm_pmon_+ASM
oracle 3254 1 0 20:04 ? 00:00:00 ora_pmon_orcl
oracle 3696 3203 0 20:10 pts/0 00:00:00 grep --color=auto pmon
[oracle@oracle ~]$ sqlplus

SQL*Plus: Release 12.1.0.2.0 Production on Thu Feb 9 20:10:36 2017

Copyright (c) 1982, 2014, Oracle. All rights reserved.

Enter user-name: / as sysdba

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options

SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> exit;
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options
[oracle@oracle ~]$ ps -ef|grep pmon
grid 3135 1 0 20:03 ? 00:00:00 asm_pmon_+ASM
oracle 3714 3203 0 20:11 pts/0 00:00:00 grep --color=auto pmon

[oracle@oracle ~]$ su - grid
Password:
Last login: Thu June 21 20:02:32 PST 2017 on pts/0
[grid@oracle ~]$ sqlplus

SQL*Plus: Release 12.1.0.2.0 Production on Thu June 21 20:13:24 2017

Copyright (c) 12182, 2014, Oracle. All rights reserved.

Enter user-name: / as sysasm

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Automatic Storage Management option

SQL> shut immediate;
ASM diskgroups dismounted
ASM instance shutdown
SQL> exit;
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Automatic Storage Management option