pkgsrc/net/netcat/DESCR

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Netcat is a simple Unix utility which reads and writes data across
network connections, using TCP or UDP protocol. It is designed to
be a reliable "back-end" tool that can be used directly or easily
driven by other programs and scripts. At the same time, it is a
feature-rich network debugging and exploration tool, since it can
create almost any kind of connection you would need and has several
interesting built-in capabilities.