term% ls -F
term% pwd
term% cat index.txt
PREP(1)                     General Commands Manual                    PREP(1)

       prep - prepare text for statistical processing

       prep [ -dio ] file ...

       Prep  reads each file in sequence and writes it on the standard output,
       one `word' to a line.  A word is a string of alphabetic characters  and
       imbedded  apostrophes,  delimited  by  space or punctuation.  Hyphented
       words are broken apart; hyphens at the end of lines are removed and the
       hyphenated parts are joined.  Strings of digits are discarded.

       The following option letters may appear in any order:

       -d     Print the word number (in the input stream) with each word.

       -i     Take  the  next  file as an `ignore' file.  These words will not
              appear in the output.  (They will be counted,  for  purposes  of
              the -d count.)

       -o     Take the next file as an `only' file.  Only these words will ap‐
              pear in the output.  (All other words will also be  counted  for
              the -d count.)

       -p     Include punctuation marks (single nonalphanumeric characters) as
              separate output lines.  The punctuation marks  are  not  counted
              for the -d count.

       Ignore and only files contain words, one per line.