How can i run an OS command in a stored procedure?

Hi, I'm creating a stored procedure in which I need to copy a file from one directory to another.
I know that in Forms, this can be done with the "host" function, but it doesn't work in the stored procedure.
I read something in a forum about using the DBMS_SCHEDULER, with a sentence like this:
DBMS_SCHEDULER.CREATE_PROGRAM('OS_Command', 'EXECUTABLE', v_command, 0, TRUE );
where v_command is a string containing the cp command I need to execute.
Would this be correct? And would this sentence be enough for the command to be executed instantly?
Thanks in advance,
Jorge

http://www.oracle.com/technetwork/database/enterprise-edition/calling-shell-commands-from-plsql-1-1-129519.pdf

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