SQLPLUS command to start oracle pdbs

sqlplus sys/xxxxx as sysdba@pdborcl.xxxx.com

SQL*Plus: Release 12.1.0.2.0 Production on Fri Nov 4 12:07:01 2016

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

SQL> SELECT name,open_mode from v$pdbs ORDER BY name;

NAME                           OPEN_MODE
------------------------------ ----------
PDB$SEED                       READ ONLY
PDBORCL                        MOUNTED

SQL> alter pluggable database pdborcl open read write;

Pluggable database altered.

SQL> SELECT name,open_mode from v$pdbs ORDER BY name;

NAME                           OPEN_MODE
------------------------------ ----------
PDB$SEED                       READ ONLY
PDBORCL                        READ WRITE

SQL>