How to execute unix command in plsql block( urgent)

Hi All,
i want rename the unix folder to New name on update non_employee table . So, please give me idea how to use unix command here.... Please suggest me ASAP ... Its urgent
CREATE or REPLACE TRIGGER NON_EMPLOYEE_AftUpd_trg
AFTER UPDATE ON NON_EMPLOYEE
FOR EACH ROW
BEGIN
IF :new.DIST_LIVELINK_PATH <> :old.DIST_LIVELINK_PATH THEN
rename unixfolder1 to :new.dist_livelink_path.
end IF;
END;

The solution will depend a lot on your Oracle version, which you forgot to mention ;)
btw shouldn't that be (in pseudocode)
rename :old.dist_livelink_path to :new.dist_livelink_pathotherwise it will always fail after the first time?
In Unix that would require the mv command.

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host_command:ORA$PIPE$002D19820001
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stat:0
stat2:0
errormsg:touch /home/oracle/testting.txt
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ORA-06512: at line 33
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I m working on Oracle 11g and AIX unix server.

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