[oracle@odb12c ~]$ sqlplus  / as sysdba


SQL*Plus: Release 12.1.0.2.0 Production on Tue Oct 20 11:27:52 2015


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




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 file#, name FROM v$datafile WHERE con_id = 1 ORDER BY file#;


     FILE# NAME
---------- ----------------------------------------------------------------------------------------------------
         1 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_system_bz56y35w_.dbf
         3 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_sysaux_bz56wd04_.dbf
         4 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_undotbs1_bz5705kc_.dbf
         6 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_users_bz5704dv_.dbf

SQL> SELECT file#, name FROM v$datafile WHERE con_id = 1 ORDER BY file#;


     FILE# NAME
---------- ----------------------------------------------------------------------------------------------------
         1 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_system_bz56y35w_.dbf
         3 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_sysaux_bz56wd04_.dbf
         4 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_undotbs1_bz5705kc_.dbf
         6 /U01/app/oracle/oradata/ODB12C/datafile/o1_mf_users_bz5704dv_.dbf


SQL> ALTER DATABASE MOVE DATAFILE '/U01/app/oracle/oradata/ODB12C/datafile/o1_mf_users_bz5704dv_.dbf' to '/tmp/user.dbf';


Database altered.


SQL> SELECT file_id, file_name FROM dba_data_files WHERE file_id = 6;


   FILE_ID FILE_NAME
---------- ----------------------------------------------------------------------------------------------------
         6 /tmp/user.dbf
SQL> ALTER DATABASE MOVE DATAFILE 6 to '/U01/app/oracle/oradata/ODB12C/datafile/user.dbf';


Database altered.
SQL> SELECT file_id, file_name FROM dba_data_files WHERE file_id = 6;


   FILE_ID FILE_NAME
---------- ----------------------------------------------------------------------------------------------------
         6 /U01/app/oracle/oradata/ODB12C/datafile/user.dbf