Using Netcat for File Transfers

Using Netcat for File Transfers

Netcat is like a swiss army knife for geeks. It can be used for just about anything involving TCP or UDP. One of its most practical uses is to transfer files. Non *nix people usually don't have SSH setup, and it is much faster to transfer stuff with netcat then setup SSH. netcat is just a single executable, and works across all platforms (Windows,Mac OS X, Linux).

On the receiving end running,

nc -l -p 1234 > out.file

will begin listening on port 1234.

On the sending end running,

nc -w 3 [destination] 1234 < out.file

will connect to the receiver and begin sending file.

For faster transfers if both sender and receiver has some basic *nix tools installed, you can compress the file during sending process,

On the receiving end,

nc -l -p 1234 | uncompress -c | tar xvfp -

On the sending end,

tar cfp - /some/dir | compress -c | nc -w 3 [destination] 1234

A much cooler but less useful use of netcat is, it can transfer an image of the whole hard drive over the wire using a command called dd.

On the sender end run,

dd if=/dev/hda3 | gzip -9 | nc -l 3333

On the receiver end,

nc [destination] 3333 | pv -b > hdImage.img.gz

Be warned that file transfers using netcat are not encrypted, anyone on the network can grab what you are sending, so use this only on trusted networks.

2018-06-22 08:12:26


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