formail

This is probably a dumb question and perhaps an FAQ, but anyway:

the man page for formail states:

     To split up a digest one usually uses:
          formail +1 -ds >>the_mailbox_of_your_choice
     or
          formail +1 -ds procmail

Call me crazy, but I don't see where it allows you to tell it what file 
to do this to.  Assuming I have a file in my /Users/luomat called 
'digest.txt' and I want to have formail split it up (even though it only 
has the From/Subject/To/Date lines) how can I do that?

Pls CC any response to me 476tjl(_at_)ptsmail(_dot_)ptsem(_dot_)edu as I don't 
get this 
list.

Thanks
TjL

--
Timothy J. Luoma  <476tjl(_at_)ptsmail(_dot_)ptsem(_dot_)edu>
Email: ASCII preferrred / NeXTMail for necessary attachments /  NO MIME!
YOUR 'REPLY-TO' LINE WILL BE REMOVED BY MY STUPID Microsoft MAILREADER!!
PLEASE TELL ME IF YOUR "FROM" ADDRESS IS NOT YOUR PREFERRED EMAIL ADDRESS.