SQL & PL/SQL

Hi ,
I want to open a file ,read it line by line and if i find one particular word i want to display the whole line.
I tried writing a procedure but not getting desired output.

DECLARE
x utl_file.file_type;
y varchar2(200);
BEGIN
x:= utl_file.fopen('TRACE1',DB_ora_111_trc.txt','R');
LOOP
BEGIN

UTL_FILE.GET_LINE(x,y);
if x='select' then
dbms_output.put_line(x);
end if;

EXCEPTION
WHEN NO_DATA_FOUND THEN EXIT ;
END;
END LOOP;
utl_file.fclose(x);
END;
/

Here i am opening a tkprof file and trying to grep for select word and if it is found,display the whole select query.The above is not showing any output.Kindly assist me since i am new to coding.

Thanks