PTX(1)                                                     PTX(1)

     NAME
          ptx - permuted index

     SYNOPSIS
          ptx [ option ] ...  [ input [ output ] ]

     DESCRIPTION
          Ptx generates a permuted index to file input on file output
          (standard input and output default).  It has three phases:
          the first does the permutation, generating one line for each
          keyword in an input line.  The keyword is rotated to the
          front.  The permuted file is then sorted.  Finally, the
          sorted lines are rotated so the keyword comes at the middle
          of the page.  Ptx produces output in the form:

               .xx "tail" "before keyword" "keyword and after" "head"

          where .xx may be an nroff or troff(1) macro for user-defined
          formatting.  The before keyword and keyword and after fields
          incorporate as much of the line as will fit around the key-
          word when it is printed at the middle of the page.  Tail and
          head, at least one of which is an empty string "", are
          wrapped-around pieces small enough to fit in the unused
          space at the opposite end of the line.  When original text
          must be discarded, `/' marks the spot.

          The following options can be applied:

          -f   Fold upper and lower case letters for sorting.

          -t   Prepare the output for the phototypesetter; the default
               line length is 100 characters.

          -w n Use the next argument, n, as the width of the output
               line.  The default line length is 72 characters.

          -g n Use the next argument, n, as the number of characters
               to allow for each gap among the four parts of the line
               as finally printed.  The default gap is 3 characters.

          -o only
               Use as keywords only the words given in the only file.

          -i ignore
               Do not use as keywords any words given in the ignore
               file.  If the -i and -o options are missing, use
               /usr/lib/eign as the ignore file.

          -b break
               Use the characters in the break file to separate words.

     PTX(1)                                                     PTX(1)

               In any case, tab, newline, and space characters are
               always used as break characters.

          -r   Take any leading nonblank characters of each input line
               to be a reference identifier (as to a page or chapter)
               separate from the text of the line.  Attach that iden-
               tifier as a 5th field on each output line.

          The index for this manual was generated using ptx.

     FILES
          sort(1)
          /usr/lib/eign

     BUGS
          Line length counts do not account for overstriking or pro-
          portional spacing.