The scratch buffer can be interacted with from the filesystem interface.

  - try running "ad -9p ls ad"

    -> you should see a "scratch" file listed


  - you can read the current content of the scratch buffer like so:

    -> ad -9p read ad/scratch


  - you can append to the scratch buffer in the same way as appending to any other buffer body:

    -> echo "hello from the shell" | ad -9p write ad/scratch


  - you can clear the scratch buffer using the "clear-scratch" command

    -> try running it from this buffer, the scratch or writing it to the "ad/ctl" file
