Code:
          
         allocate channel d1 type disk; 
         backup
             full
           #skip offline
           #skip readonly
             skip inaccessible
             tag backup_db_full 
             filesperset 5 
             format 'df_%d_t%t_s%s_p%p'
             (database include current controlfile);
          release channel d1;
Hope this would help you.

Sam