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PTX(1)											   PTX(1)

       ptx - permuted index

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

       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 key-
       word and keyword and after fields incorporate as much of the line as will fit  around  the
       keyword	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  charac-

       -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.  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 identi-
	      fier (as to a page or chapter) separate from the text of	the  line.   Attach  that
	      identifier as a 5th field on each output line.

       The index for this manual was generated using ptx.


       Line length counts do not account for overstriking or proportional spacing.

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