to...@tuxteam.de (12023-12-04):
> These days, even bash can do it:

Zsh could years before.

> (alas, it can't do TCP server, which is a pity)

socat can do TCP server. And UDP client, and UDP server, and TLS/SSL
client and server, and Unix sockets, and SOCKS, and tun, and…

(And zsh seems to be able to do TCP server.)

Regards,

-- 
  Nicolas George

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