How do I pipe output into Visual Studio Code?

As of September 2016, it does not appear to be supported, but there's an open issue to implement it:

https://github.com/Microsoft/vscode/issues/6161

I'm on Ubuntu Gnome 17.10 (Artful Aardvark), and I run Visual Studio Code v1.19.3. Just piping to code is not enough to bin to stdin.

$ ps aux | code
Run with 'code -' to read from stdin (e.g. 'ps aux | grep code | code -').

You have to add the - operator:

$ ps aux | code -

That's working and opens a new text tab filled by the command output.

Since version 1.19.1, you can pipe your output to the current window by invoking:

<command> | code -

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If you are using version 1.19 or earlier, you don't need the arg:

<command> | code