You can do something like this...
CREATE OR REPLACE PROCEDURE ProcA
(a_dMonth IN DATE,
a_nStatus OUT NUMBER
)
AS
Now call the procedure in a sql script...
declare
nStatus Number :=0;
e_exception EXCEPTION;
begin
ProcA(to_date(&&1,'yyyymmdd',nStatus);
if nStatus > 0 then
dbms_output.put_line('yr message '||nStatus);
raise e_exception;
end if;
EXCEPTION
when e_exception then
null;
end;
/