After running this command:
dbus-send --system --type=method_call --print-reply --dest=org.bluez /org/bluez/hci0 org.bluez.Adapter.SetMode string:discoverable

in order to make my CentOS 4 machine discoverable for Bluetooth devices, I get the following error:
dbus-send: command not found

What do I need to do to make dbus work, at least for the purpose described above? Or if there is any workaround without having to touch dbus, please tell...