$ curl cheat.sh/
# iperf3
# Traffic generator for testing network bandwidth.
# More information: <https://iperf.fr>.

# Run iperf3 as a server:
iperf3 -s

# Run an iperf3 server on a specific port:
iperf3 -s -p port

# Start bandwidth test:
iperf3 -c server

# Run iperf3 in multiple parallel streams:
iperf3 -c server -P streams

# Reverse direction of the test. Server sends data to the client:
iperf3 -c server -R

$
Follow @igor_chubin cheat.sh tldr