Open the LilyPond log file in operating system-specific text editor:
abjad> iotools.log() # doctest: +SKIP
GNU LilyPond 2.12.2
Processing `0440.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Layout output to `0440.ps'...
Converting to `./0440.pdf'...
Exit text editor in the usual way.
Return none.