How do i check nic's speed?

I just installed a new gigabit nic network interface card in linux How do you tell if your internet is set to a gigabit speed? I see ethtool has an option to set the speed, but I can't seem to figure out how to report its current speed.

Just use a command like: ethtool eth0 to get the needed info. Ex:

$ sudo ethtool eth0 | grep Speed

Speed: 1000Mb/s