It's interactive and has the '?' command for help.

      pkgadd -d cdrom1 ispell

      ispell -M -b -S -L4 -B uw7faq

           where
             -M   Display menu of commands at the bottom of the screen
             -b   Make a backup copy of the file uw7faq
             -S   Sort the list of suggestions by probable correctness
             -L4  Print four lines of context around the misspelled word
             -B   Attempt to catch run together words like redwoodforrest
         uw7faq   The filename to be checked

Uw7 comes with the spell command, but I find it hard to use.
<mschalit@pacbell.net>
gerberb@zenez.com