ps -ef | grep pmon
export ORACLE_SID=prdoradg
echo $ORACLE_SID

sqlplus 
set pages 400 lines 200;
select * from V$FLASH_RECOVERY_AREA_USAGE;

rman target /
CROSSCHECK ARCHIVELOG ALL;
DELETE OBSOLETE;

-- VER LOGS 
adrci
show home
set home diag/rdbms/prdoradg/prdoradg
show alert -tail -f