| This is an example program demonstrating how to use the EchoTCPClient
and EchoUDPClient classes. This program connects to the default echo
service port of a specified server, then reads lines from standard
input, writing them to the echo server, and then printing the echo.
The default is to use the TCP port. Use the -udp flag to use the UDP
port.
Usage: echo [-udp]
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