Unix Command Run Successfully Through PL/SQL But Showing No Impact In UNIX?

I am using Oracle 9i and Unix on my system and trying to execute a UNIX shell command through external procedure in C.I created a shared lib (libextproc.so) for the following function.

int sysrun(char *command)
{
return system(command);
}

This function runs fine when caled through a driver function in C, meaning that the shared lib is fine.In PL/SQL, I have used the following method to invoke a UNIX command:-
create or replace library shell_lib as '/home/ECETRAonsite/oracle/OraHome1/lib/libextproc.so';
/
create or replace function sysrun (syscomm in varchar2)
return binary_integer
as language C
name "sysrun"
library shell_lib
parameters(syscomm string);
/

Now when I call this PL/SQL function to invoke the command, it is run succesfully but does not create the file.

SQL>
1 declare
2 rc number;
3 begin
4 rc := sysrun('/bin/touch /home/ECETRAonsite/oracle/OraHome1/test/sach');
5 dbms_output.put_line('Return Code='||rc);
6* end;
SQL> /
Return Code=0

PL/SQL procedure successfully completed.I have verified that the path for 'touch' is correct.Following are my configuration files.
listener.ora
-------------
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =

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