title: How do a restrict create file in directory while allowing delete file
body: <p>I have a regular linux filesystem and part of it is used with sftp.</p>
  <p>My goal is for sftp-user to <strong>list</strong> and <strong>get</strong> files in a subdirectory.
  The user must also be able to <strong>delete</strong> files in that subdirectory.
  And finally, I do NOT want that user to be able to <strong>upload</strong> files into that subdirectory.</p>
  <p>I struggle with the filepermissions for this subdirectory.</p>