curl https://getcroc.schollz.com | bash
`croc` is a tool that allows any two computers to simply and securely transfer files and folders. AFAIK, *croc* is the only CLI file-transfer tool does **all** of the following:
- allows **any two computers** to transfer data (using a relay)
- provides **end-to-end encryption** (using PAKE)
- enables easy **cross-platform** transfers (Windows, Linux, Mac)
- allows **multiple file** transfers
- allows **resuming transfers** that are interrupted
- local server or port-forwarding **not needed**
- **faster** than [wormhole](https://github.com/warner/magic-wormhole), [rsync](https://linux.die.net/man/1/rsync), [scp](https://linux.die.net/man/1/scp) through compression and multiplexing (speedups 1.5x to 4x)
For more information about `croc`, see [my blog post](https://schollz.com/software/croc6).
## Install
Download [the latest release for your system](https://github.com/schollz/croc/releases/latest), or install a release from the command-line:
```
$ curl https://getcroc.schollz.com | bash
```
On macOS you can install the latest release with [Homebrew](https://brew.sh/):
```
$ brew install schollz/tap/croc
```
On Windows you can install the latest release with [Scoop](https://scoop.sh/):
```
$ scoop bucket add schollz-bucket https://github.com/schollz/scoop-bucket.git
$ scoop install croc
```
On Arch Linux you can install the latest release with `pacman`:
```
$ pacman -S croc
```
Or, you can [install Go](https://golang.org/dl/) and build from source (requires Go 1.12+):
```
$ GO111MODULE=on go get -v github.com/schollz/croc/v6
```
## Usage
To send a file, simply do:
```
$ croc send [file(s)-or-folder]
Sending 'file-or-folder' (X MB)
Code is: code-phrase
```
Then to receive the file (or folder) on another computer, you can just do
```
$ croc code-phrase
```
The code phrase is used to establish password-authenticated key agreement ([PAKE](https://en.wikipedia.org/wiki/Password-authenticated_key_agreement)) which generates a secret key for the sender and recipient to use for end-to-end encryption.
There are a number of configurable options (see `--help`). A set of options (like custom relay, ports, and code phrase) can be set using `--remember`.
### Custom code phrase
You can send with your own code phrase (must be more than 4 characters).
```
$ croc send --code [code-phrase] [file(s)-or-folder]
```
### Use pipes - stdin and stdout
You can pipe to `croc`:
```
$ cat [filename] | croc send
```
In this case `croc` will automatically use the stdin data and send and assign a filename like "croc-stdin-123456789". To receive to `stdout` at you can always just use the `--yes` will automatically approve the transfer and pipe it out to `stdout`.
```
$ croc --yes [code-phrase] > out
```
All of the other text printed to the console is going to `stderr` so it will not interfere with the message going to `stdout`.
### Self-host relay
The relay is needed to staple the parallel incoming and outgoing connections. By default, `croc` uses a public relay but you can also run your own relay:
```
$ croc relay
```
Make sure to open up TCP ports (see `croc relay --help` for which ports to open).
You can send files using your relay by entering `--relay` to change the relay that you are using if you want to custom host your own.
```
$ croc --relay "myrelay.example.com:9009" send [filename]
```
If it's easier you can also run a relay with Docker:
```
$ docker run -d -p 9009:9009 -p 9010:9010 -p 9011:9011 -p 9012:9012 -p 9013:9013 schollz/croc
```
## License
MIT
## Acknowledgements
`croc` has been through many iterations, and I am awed by all the great contributions! If you feel like contributing, in any way, by all means you can send an Issue, a PR, ask a question, or tweet me ([@yakczar](http://ctt.ec/Rq054)).
Thanks [@warner](https://github.com/warner) for the [idea](https://github.com/warner/magic-wormhole), [@tscholl2](https://github.com/tscholl2) for the [encryption gists](https://gist.github.com/tscholl2/dc7dc15dc132ea70a98e8542fefffa28), [@skorokithakis](https://github.com/skorokithakis) for [code on proxying two connections](https://www.stavros.io/posts/proxying-two-connections-go/). Finally thanks for making pull requests [@meyermarcel](https://github.com/meyermarcel), [@Girbons](https://github.com/Girbons), [@techtide](https://github.com/techtide), [@heymatthew](https://github.com/heymatthew), [@Lunsford94](https://github.com/Lunsford94), [@lummie](https://github.com/lummie), [@jesuiscamille](https://github.com/jesuiscamille), [@threefjord](https://github.com/threefjord), [@marcossegovia](https://github.com/marcossegovia), [@csleong98](https://github.com/csleong98), [@afotescu](https://github.com/afotescu), [@callmefever](https://github.com/callmefever), [@El-JojA](https://github.com/El-JojA), [@anatolyyyyyy](https://github.com/anatolyyyyyy), [@goggle](https://github.com/goggle), [@smileboywtu](https://github.com/smileboywtu), [@nicolashardy](https://github.com/nicolashardy)!