Unix command from Plsql block

Hi all ,
I have tried unix command from PLSQL Block,
Please see the code.
DECLARE
stat INTEGER;
host_command varchar2(100);
errormsg VARCHAR2(80);
command varchar2(2000);
BEGIN
command:='touch /home/oracle/testting.txt';
dbms_pipe.reset_buffer;
host_command:= dbms_pipe.unique_session_name;
dbms_output.put_line('host_command:'||host_command);
dbms_pipe.pack_message(command);
dbms_output.put_line('pack message:'||command);
stat := dbms_pipe.send_message(host_command);
dbms_output.put_line('stat:'||stat);
IF stat <> 0 THEN
raise_application_error(-20000, 'Error:'||TO_CHAR(stat)||' sending on pipe');
END IF;
stat := dbms_pipe.receive_message(host_command);
dbms_output.put_line('stat2:'||stat);
IF stat <> 0 THEN
raise_application_error(-20000, 'Error:'||TO_CHAR(stat)||' receiving on pipe');
END IF;
dbms_pipe.unpack_message(errormsg);
dbms_output.put_line('errormsg:'||errormsg);
IF errormsg <> 'SUCCESS' THEN
raise_application_error(-20000, 'Execution error: '||errormsg);
END IF;
END;
Nothing happend from this code just getting only following result with error.
-----------------result-----------------------------
host_command:ORA$PIPE$002D19820001
pack message:touch /home/oracle/testting.txt
stat:0
stat2:0
errormsg:touch /home/oracle/testting.txt
DECLARE
ERROR at line 1:
ORA-20000: Execution error: touch /home/oracle/testting.txt
ORA-06512: at line 33
Can any one tell me what i doing wrong in this code.
I m working on Oracle 11g and AIX unix server.

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