This time I’ll get it right. A convenient way to print PDF files from the
command-line (and therefore from vDos and anything derived from vDos) is the
PDF-Xchange Viewer, which is now free for any purpose:
https://www.tracker-software.com/product/pdf-xchange-viewer
It can be a bit tricky to set up so that it automatically prints to correct
page size for envelopes, A4, etc., and it easily loses its settings if you use
it to do anything with a PDF file other than simply print from the command
line.
Unlike Adobe Reader or Acrobat, it doesn’t stay open after printing from the
command-line. Unlike SumatraPDF (another program that prints from the
command-line), it can print non-standard page sizes (envelopes, Legal, etc.)
from the correct paper source in the printer.
So I’ve put together a “wrapper" around PDF-Xchange Viewer that always
maintains the correct settings for command-line printing. You do not need to
download the PDF-Xchange Viewer; it’s included in the wrapper itself. The
wrapper program is described here (with a download link):
http://www.columbia.edu/~em36/pdftoprinter.html
Of course this should be regarded as experimental, but it seems to work. I
can’t guarantee whether it will work in all circumstances, but it may be worth
a try. Or you could simply use the PDF-Xchange Viewer with the command-line
syntax described in its manual.
