command line to easily and securely send things from one computer to another
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
does not require a server or port-forwarding
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) 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.
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]
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