Progress: Continue working on completing the remove program.

Progress: Continue working on completing the remove program.

Use polling on the standard input to allow for blocking in an interruptible way.
Once there is input the file read can be called to read the input.

This finishes the `remove` program development.
I am still designating this as progress because the following wrapper programs now need to be written:
  - `rm`
  - `rmdir`
  - `unlink`