Starting from October 2009 a new ESO/VLT instrument will be offered to the astronomical community worldwide: the X-shooter spectrograph. This first secondgeneration VLT instrument is being built as a collaborative effort of several European Institutes (with INAF playing a prominent role, co-PI R. Pallavicini) and ESO. The main features of X-shooter are high efficiency and the unique capability to cover in one ”shot” a very broad spectral range, from U to K band, making the Instrument appealing for cutting-edge science. The present paper reports on the commissioning periods just held in Paranal and on the efforts made to meet all foreseen stringent requirements.