How to write CLOB parameter in a file or XML using shell script?

Question

I executed a oracle stored procedure using shell script. How can i get the OUT parameter of the procedure(CLOB) and write it in a file or XML in UNIX environment using shell script?
Edit/Delete Message

Answer 1

SQL> var c clob
SQL>
SQL> begin
  2          select
  3                  DBMS_XMLGEN.getXML(
  4                          'select rownum, object_type, object_name from user_objects where rownum <= 5'
  5                  ) into :c
  6          from    dual;
  7  end;
  8  /
PL/SQL procedure successfully completed.
SQL>
SQL> set long 999999
SQL> set heading off
SQL> set pages 0
SQL> set feedback off
SQL> set termout off
SQL> set trimspool on
// following in the script is not echo'ed to screen
set echo off
spool /tmp/x.xml
select :c from dual;
spool off
SQL>
SQL> --// file size
SQL> !ls -l /tmp/x.xml
-rw-rw-r-- 1 billy billy 583 2011-12-22 13:35 /tmp/x.xml
SQL> --// file content
SQL> !cat /tmp/x.xml
<?xml version="1.0"?>
<ROWSET>
<ROW>
  <ROWNUM>1</ROWNUM>
  <OBJECT_TYPE>TABLE</OBJECT_TYPE>
  <OBJECT_NAME>BONUS</OBJECT_NAME>
</ROW>
<ROW>
  <ROWNUM>2</ROWNUM>
  <OBJECT_TYPE>PROCEDURE</OBJECT_TYPE>
  <OBJECT_NAME>CLOSEREFCURSOR</OBJECT_NAME>
</ROW>
<ROW>
  <ROWNUM>3</ROWNUM>
  <OBJECT_TYPE>TABLE</OBJECT_TYPE>
  <OBJECT_NAME>DEPT</OBJECT_NAME>
</ROW>
<ROW>
  <ROWNUM>4</ROWNUM>
  <OBJECT_TYPE>TABLE</OBJECT_TYPE>
  <OBJECT_NAME>EMP</OBJECT_NAME>
</ROW>
<ROW>
  <ROWNUM>5</ROWNUM>
  <OBJECT_TYPE>TABLE</OBJECT_TYPE>
  <OBJECT_NAME>EMPTAB</OBJECT_NAME>
</ROW>
</ROWSET>
SQL>