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Netcat

netcat is a computer networking utility for reading from and writing to network connections using TCP or UDP. The command is designed to be a dependable back-end 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 investigation tool, since it can produce almost any kind of connection its user could need and has a number of built-in capabilities.

Features
The original netcat's features include: • Outbound or inbound connections, TCP or UDP, to or from any ports • Full DNS forward/reverse checking, with appropriate warnings • Ability to use any local source port • Ability to use any locally configured network source address • Built-in port-scanning capabilities, with randomization • Built-in loose source-routing capability • Can read command line arguments from standard input • Slow-send mode, one line every N seconds • Hex dump of transmitted and received data • Optional ability to let another program service establish connections • Optional telnet-options responder Rewrites like GNU's and OpenBSD's support additional features. For example, OpenBSD's nc supports TLS, and GNU netcat natively supports a tunneling mode supporting UDP and TCP (optionally allowing one to be tunneled over the other) in a single command,{{cite web ==Ports and reimplementations==
Ports and reimplementations
The original version of netcat was a Unix program. The last version (1.10) was released in March 1996. There are several implementations on POSIX systems, including rewrites from scratch like GNU netcat Mac OS X comes with netcat installed as of OSX 10.13 or users can use MacPorts to install a variant. Another version with more features, named bloaty nc, is also available. Solaris 11 includes netcat implementation based on OpenBSD netcat. Socat ==See also==
Source: Wikipedia ↗
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