Unix-pl/sql help reuuired

Question

Sir, I am working for some data warehouse project in which I want to invoke unix shell command from PL/SQL Block, for example, I want to invoke a sql loder from a PL/SQL block. Is it possible. I have searched in all possible resources available with me but couldn't find any solution.
Any sample code will be of great help.

Answer 1

SQL> create table customer(custid varchar2(10),account number,checknos number);
Table created.
SQL> insert into customer values('C10', 124562, 0);
1 row created.
SQL> insert into customer values('c12', 124562, 0);
1 row created.
SQL> insert into customer values('C14', 124562, 0);
1 row created.
SQL> insert into customer values('C16', 124562, 0);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from customer;
CUSTID        ACCOUNT   CHECKNOS
C10            124562          0
c12            124562          0
C14            124562          0
C16            124562          0
SQL> merge INTO customer p USING
  2  (SELECT t.*,row_number() over(order by custid ASC) rnum FROM customer t
  3  ) q ON (p.custid=q.custid)
  4  WHEN matched then
  5     UPDATE SET p.checknos=q.rnum+9000;
4 rows merged.
SQL> select * from customer;
CUSTID        ACCOUNT   CHECKNOS
C10            124562       9001
c12            124562       9004
C14            124562       9002
C16            124562       9003
SQL> Use merge for maintaining the row order...I remember this done by someone the other day....
Ravi Kumar