iftop
$ sudo apt-get install iftop
Usage
$ sudo iftop
# Show the bandwidth usage of a given interface:
$ sudo iftop -i <interface>
# Show the bandwidth usage with port information:
$ sudo iftop -P
# Do not show bar graphs of traffic:
$ sudo iftop -b
# Do not look up hostnames:
$ sudo iftop -n
Reference
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