Tools such as MRTG provide network throughput / bandwidth graphs for the current network utilisation on specific interfaces, such as eth0. How can I return that information at the command line on Linux/UNIX?
Preferably this would be without installing anything other than what is available on the system as standard.
iftop does for network usage what top(1) does for CPU usage
-- http://www.ex-parrot.com/~pdw/iftop/
I don't know how "standard" iftop is, but I was able to install it with yum install iftop
on Fedora.