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42 lines
2.2 KiB
Text
42 lines
2.2 KiB
Text
NC(1) General Commands Manual NC(1)
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NAME
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nc – arbitrary TCP and UDP connections and listens
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SYNOPSIS
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nc [-46AcDCdhklnrtUuvz] [-b boundif] [-i interval] [-p source_port] [-s source_ip_address] [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]] [--apple-delegate-pid pid]
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[--apple-delegate-uuid uuid] [--apple-ext-bk-idle] [--apple-nowakefromsleep n] [--apple-ecn mode] [hostname] [port[s]]
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DESCRIPTION
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The nc (or netcat) utility is used for just about anything under the sun involving TCP or UDP. It can open TCP connections, send UDP packets, listen on arbitrary TCP and UDP ports, do port scanning,
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and deal with both IPv4 and IPv6. Unlike telnet(1), nc scripts nicely, and separates error messages onto standard error instead of sending them to standard output, as telnet(1) does with some.
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Common uses include:
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• simple TCP proxies
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• shell-script based HTTP clients and servers
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• network daemon testing
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• a SOCKS or HTTP ProxyCommand for ssh(1)
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• and much, much more
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The options are as follows:
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-4 Forces nc to use IPv4 addresses only.
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-6 Forces nc to use IPv6 addresses only.
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-A Set SO_RECV_ANYIF on socket.
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CLIENT/SERVER MODEL
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It is quite simple to build a very basic client/server model using nc. On one console, start nc listening on a specific port for a connection. For example:
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$ nc -l 1234
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nc is now listening on port 1234 for a connection. On a second console (or a second machine), connect to the machine and port being listened on:
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$ nc 127.0.0.1 1234
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There should now be a connection between the ports. Anything typed at the second console will be concatenated to the first, and vice-versa. After the connection has been set up, nc does not really
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care which side is being used as a ‘server’ and which side is being used as a ‘client’. The connection may be terminated using an EOF (‘^D’).
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vim:ft=man:
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