Copy writable streams to other writable streams.
Copy writable stream to multiple writable streams.
npm install --global stream-copy
Copy process.stdout to a file:
var stream = require('stream');stream.copy = require('stream-copy').copy;stream.copy(process.stdout, fs.createWriteStream(filename));
You can copy to multiple streams:
stream.copy(origin, stream1, stream2...)
how? learn more