Find ORACL_HOME

How Find ORACLE_HOME

SQL> var OHM varchar2(100);
SQL> EXEC dbms_system.get_env('ORACLE_HOME', :OHM)
BEGIN dbms_system.get_env('ORACLE_HOME', :OHM); END;

                                               *
ERROR at line 1:
ORA-06550: line 1, column 48:
PLS-00103: Encountered the symbol "" when expecting one of the following:
:= . ( % ;
The symbol "" was ignored.


SQL> EXEC dbms_system.get_env('ORACLE_HOME', :OHM);

PL/SQL procedure successfully completed.

SQL> PRINT OHM

OHM
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/u03/orauat/db/tech_st/11.1.0

SQL>