Stdin to subprocesses

[DanielSincere]

When I run terraform apply, and terraform asks for approval, and I type yes, nothing happens. Seems that Stdin is not forwarded to the subprocess?

Notes

1. Foundation.Process has a standardInput field, can we forward input to this field?
2. What do we want the API to look like
3. Can we make a simple example? Maybe rm -i filename.
4. How can we unit test this?