How to recover Loss of Datafile of a SYSTEM tablespace?

Corrupted/lost data file of system tablespace can be recovered using RMAN provided that there is a backup.

Here below is an example of  RMAN job command script for restoring  system tablespace.

RMAN>
RUN
{
  RESTORE TABLESPACE SYSTEM;
  RECOVER TABLESPACE SYSTEM;
  ALTER DATABASE OPEN;
}
 RUN
{
  RESTORE TABLESPACE NEWTBS;
  RECOVER TABLESPACE NEWTBS;
  ALTER DATABASE OPEN;
}