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71 lines
2.3 KiB
Markdown
71 lines
2.3 KiB
Markdown
---
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title: "rclone rcat"
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description: "Copies standard input to file on remote."
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versionIntroduced: v1.38
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# autogenerated - DO NOT EDIT, instead edit the source code in cmd/rcat/ and as part of making a release run "make commanddocs"
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---
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# rclone rcat
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Copies standard input to file on remote.
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## Synopsis
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Reads from standard input (stdin) and copies it to a single remote file.
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echo "hello world" | rclone rcat remote:path/to/file
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ffmpeg - | rclone rcat remote:path/to/file
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If the remote file already exists, it will be overwritten.
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rcat will try to upload small files in a single request, which is
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usually more efficient than the streaming/chunked upload endpoints,
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which use multiple requests. Exact behaviour depends on the remote.
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What is considered a small file may be set through
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`--streaming-upload-cutoff`. Uploading only starts after
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the cutoff is reached or if the file ends before that. The data
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must fit into RAM. The cutoff needs to be small enough to adhere
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the limits of your remote, please see there. Generally speaking,
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setting this cutoff too high will decrease your performance.
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Use the `--size` flag to preallocate the file in advance at the remote end
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and actually stream it, even if remote backend doesn't support streaming.
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`--size` should be the exact size of the input stream in bytes. If the
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size of the stream is different in length to the `--size` passed in
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then the transfer will likely fail.
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Note that the upload cannot be retried because the data is not stored.
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If the backend supports multipart uploading then individual chunks can
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be retried. If you need to transfer a lot of data, you may be better
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off caching it locally and then `rclone move` it to the
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destination which can use retries.
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```
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rclone rcat remote:path [flags]
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```
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## Options
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```
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-h, --help help for rcat
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--size int File size hint to preallocate (default -1)
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```
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Options shared with other commands are described next.
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See the [global flags page](/flags/) for global options not listed here.
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### Important Options
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Important flags useful for most commands
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```
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-n, --dry-run Do a trial run with no permanent changes
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-i, --interactive Enable interactive mode
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-v, --verbose count Print lots more stuff (repeat for more)
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```
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## See Also
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* [rclone](/commands/rclone/) - Show help for rclone commands, flags and backends.
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