create or replace procedure host( cmd in varchar2 )
as
status number;
begin
dbms_pipe.pack_message( cmd );
status := dbms_pipe.send_message( 'HOST_PIPE' );
if ( status <> 0 ) then raise_application_error( -20001, 'Pipe error' );
end if;
end;
OS: OEL 5.5
RDBMS: Oracle 10.2.0
Before installing Oracle server do all the jobs with server network (ip, host_naming, etc.) in order to avoid getting error above.