How to get log only

[Thomas Morley]

Hi,

while debugging some files I'm interested in the log only, thus I'd
like to avoid creating any other output.
  $ lilypond -dlog-file=AAALOG --formats=#f
-ddelete-intermediate-files file-1.ly file-2.ly
still returns .ps-files.

What's the correct command?

Thanks,
  Harm