How to execute sqlplus command in html_db

The problem for this is caused that we wanna create a Java procedure for host calls on Unix environment, it seems be working on oracle database, and right now we want to use it under html_db, but we can't find any places to be able to execute the following commands "exec rc('/bin/ps -ef');" or "exec :x:= run_cmd('/bin/ps -ef');", html_db engine always complain this is not the invalid sql command when I type it in sql workshop. How can I do it in html_db? Hope any experts help me of it. Thanks already!

thanks again Fred,
I tried using both htp.p(run_cmd('/bin/mkdir /tmp/linkin'))
I did this because if the command was executed then i should be able to see the director being created in the /tmp directory. Its still not the case. But am able to create one from sqlplus :-).
Still wondering how to solve this. If you have any suggestion of submitting a shell job from within htmldb, please let me know.
Anand

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