Cloning PDB within the same CDB

[oracle@myorasrv ~]$ . oraenv
ORACLE_SID = [cdb2] ? cdb2
The Oracle base for ORACLE_HOME=/u01/app/oracle/product/12.1.0/dbhome_1 is /u01/app/oracle
[oracle@myorasrv ~]$ mkdir $ORACLE_BASE/oradata/cdb2/pdb2_2
[oracle@myorasrv ~]$ sqlplus / as sysdba

SQL> alter pluggable database pdb2_1 close;

Pluggable database altered.

SQL> alter pluggable database pdb2_1 open;

Pluggable database altered.

SQL> alter pluggable database pdb2_1 close;

Pluggable database altered.

SQL> alter pluggable database pdb2_1 open read only;

Pluggable database altered.

SQL> create pluggable database pdb2_2 from pdb2_1
  2  CREATE_FILE_DEST='/u01/app/oracle/oradata/cdb2/pdb2_2';

Pluggable database created.

SQL> select name,open_mode from v$pdbs;

NAME                   OPEN_MODE
------------------------------ ----------
PDB$SEED               READ ONLY
PDB2_1                   READ ONLY
PDB2_2                   MOUNTED

SQL> alter pluggable database pdb2_1 close;

Pluggable database altered.

SQL> alter pluggable database pdb2_1 open;

Pluggable database altered.

SQL> alter pluggable database pdb2_2 open;

Pluggable database altered.

SQL> select name,open_mode from v$pdbs;

NAME                   OPEN_MODE
------------------------------ ----------
PDB$SEED               READ ONLY
PDB2_1                   READ WRITE
PDB2_2                   READ WRITE

SQL>