returns nothing, just straight back to the prompt with no output.
From Xubuntu
xubuntu@xubuntu:~$ dmesg|grep eth0
[ 15.419833] tg3 0000:04:00.0 eth0: Tigon3 [partno(BCM57780) rev 57780001] (PCI Express) MAC address <snip>
[ 15.419846] tg3 0000:04:00.0 eth0: attached PHY driver [Broadcom BCM57780] (mii_bus:phy_addr=400:01)
[ 15.419857] tg3 0000:04:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[ 15.419866] tg3 0000:04:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[ 15.481354] tg3 0000:04:00.0 enp4s0: renamed from eth0
xubuntu@xubuntu:~$