thanks very much for your time and help
If the folder contains only PDFs, then
open -a Preview.app ~/Desktop/someFolder
and to choose only the pdfs from among other file types in the folder:
open -a Preview.app ~/Desktop/someFolder/*.pdf
PS for more details about file-opening options and switches, you could try the Terminal.app (Bash) man command, with something like:
man -t "open" | pstopdf -l -i -o ~/Desktop/open.pdf
open -a Preview ~/Desktop/open.pdf
See: Generate a PDF copy of the man page for a shell command
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thanks very much !