Preview.app opening multiple files

[Joseph Alotta]

Greetings,

I have dozens of these one page pdf files.  If I select them all in 
finder and
double click, Preview opens them in one window as a multiple-page 
document.  This is
what I'd like to have happen.

If I do them in perl:

system "open *.pdf";

Preview opens them as multiple windows.  How can I tell Preview to open 
them as
it does in finder?

I tried "cat *.pdf > /tmp/big.pdf"  but that doesn't work either.  It 
only sees the
first page.

Thank you,

Joe Alotta