# Netcat File Transfer

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.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wiki.smhuda.com/pentesting/tool-usage/netcat-file-transfer.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.