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Netcat is one of the most useful network utilities I know of.
In the simplest terms, netcat is a utility that reads and writes data across the network.
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The netcat utility works on the same principle as the cat utility, but over the network. This can be very useful in a number of situations, such as testing remote services, or for use in scripts, or just to copy files over the network. According to one source, you can even clone a hard drive over the network using netcat and dd.
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