Provided by: kitty_0.41.1-2_amd64 
Name
kitten-transfer - Transfer files easily over the TTY device
Overview
Added in version 0.30.0.
Transfer files to and from remote computers over the TTY device itself. This means that file transfer
works over nested SSH sessions, serial links, etc. Anywhere you have a terminal device, you can transfer
files.
This kitten supports transferring entire directory trees, preserving soft and hard links, file
permissions, times, etc. It even supports the rsync protocol to transfer only changes to large files.
SEE ALSO:
See the Remote files kitten
Basic usage
Simply ssh into a remote computer using the ssh kitten and run the this kitten (which the ssh kitten
makes available for you on the remote computer automatically). Some illustrative examples are below. To
copy a file from a remote computer:
<local computer> $ kitten ssh my-remote-computer
<remote computer> $ kitten transfer some-file /path/on/local/computer
This, will copy some-file from the computer into which you have SSHed to your local computer at
/path/on/local/computer. kitty will ask you for confirmation before allowing the transfer, so that the
file transfer protocol cannot be abused to read/write files on your computer.
To copy a file from your local computer to the remote computer:
<local computer> $ kitten ssh my-remote-computer
<remote computer> $ kitten transfer --direction=upload /path/on/local/computer remote-file
For more detailed usage examples, see the command line interface section below.
NOTE:
If you dont want to use the ssh kitten, you can install the kitten binary on the remote machine
yourself, it is a standalone, statically compiled binary available from the kitty releases page. Or
you can write your own script/program to use the underlying file transfer protocol.
Avoiding the confirmation prompt
Normally, when you start a file transfer kitty will prompt you for confirmation. This is to ensure that
hostile programs running on a remote machine cannot read/write files on your computer without your
permission. If the remote machine is trusted, then you can disable the confirmation prompt by:
1. Setting the file_transfer_confirmation_bypass option to some password.
2. When invoking the kitten use the --permissions-bypass to supply the password you set in step one.
WARNING:
Using a password to bypass confirmation means any software running on the remote machine could
potentially learn that password and use it to gain full access to your computer.
Delta transfers
This kitten has the ability to use the rsync protocol to only transfer the differences between files. To
turn it on use the --transmit-deltas option. Note that this will actually be slower when transferring
small files or on a very fast network, because of round trip overhead, so use with care.
Source code for transfer
The source code for this kitten is available on GitHub.
Command line interface
kitten transfer [options] source_files_or_directories destination_path
Transfer files over the TTY device. Can be used to send files between any two computers provided there is
a TTY connection between them, such as over SSH. Supports copying files, directories (recursively),
symlinks and hardlinks. Can even use an rsync like protocol to copy only changes between files. When
copying multiple files, use the --confirm-paths option to see what exactly will be copied. The easiest
way to use this kitten is to first ssh into the remote computer with the ssh kitten:
$ kitten ssh my-remote-computer
Then, on the remote computer run the transfer kitten to do your copying. To copy a file from the remote
computer to the local computer, run:
$ kitten transfer remote-file /path/to/local-file
This will copy remote-file from the remote computer to /path/to/local-file on the local computer.
Similarly, to copy a file from the local computer to the remote one, run:
$ kitten transfer --direction=upload /path/to/local-file remote-file
This will copy /path/to/local-file from the local computer to remote-file on the remote computer.
Multiple files can be copied:
$ kitten transfer file1 file2 /path/to/dir/
This will put file1 and file2 into the directory /path/to/dir/ on the local computer.
Directories can also be copied, recursively:
$ kitten transfer dir1 /path/to/dir/
This will put dir1 and all its contents into /path/to/dir/ on the local computer.
Note that when copying multiple files or directories, the destination must be an existing directory on
the receiving computer. Relative file paths are resolved with respect to the current directory on the
computer running the kitten and the home directory on the other computer. It is a good idea to use the
--confirm-paths command line flag to verify the kitten will copy the files you expect it to.
Options
--direction <DIRECTION>, -d <DIRECTION>
Whether to send or receive files. send or download copy files from the computer on which the
kitten is running (usually the remote computer) to the local computer. receive or upload copy
files from the local computer to the remote computer. Default: download Choices: download,
receive, send, upload
--mode <MODE>, -m <MODE>
How to interpret command line arguments. In mirror mode all arguments are assumed to be files/dirs
on the sending computer and they are mirrored onto the receiving computer. Files under the HOME
directory are copied to the HOME directory on the receiving computer even if the HOME directory is
different. In normal mode the last argument is assumed to be a destination path on the receiving
computer. The last argument must be an existing directory unless copying a single file. When it is
a directory it should end with a trailing slash. Default: normal Choices: mirror, normal
--compress <COMPRESS>
Whether to compress data being sent. By default compression is enabled based on the type of file
being sent. For files recognized as being already compressed, compression is turned off as it just
wastes CPU cycles. Default: auto Choices: always, auto, never
--permissions-bypass <PERMISSIONS_BYPASS>, -p <PERMISSIONS_BYPASS>
The password to use to skip the transfer confirmation popup in kitty. Must match the password set
for the file_transfer_confirmation_bypass option in kitty.conf. Note that leading and trailing
whitespace is removed from the password. A password starting with ., / or ~ characters is assumed
to be a file name to read the password from. A value of - means read the password from STDIN. A
password that is purely a number less than 256 is assumed to be the number of a file descriptor
from which to read the actual password.
--confirm-paths, -c
Before actually transferring files, show a mapping of local file names to remote file names and
ask for confirmation.
--transmit-deltas, -x
If a file on the receiving side already exists, use the rsync algorithm to update it to match the
file on the sending side, potentially saving lots of bandwidth and also automatically resuming
partial transfers. Note that this will actually degrade performance on fast links or with small
files, so use with care.
Author
Kovid Goyal
Copyright
2025, Kovid Goyal
0.41.1 Jun 05, 2025 kitten-transfer(1)