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DVISELECT(1)                         General Commands Manual                         DVISELECT(1)

NAME
       dviselect - extract pages from DVI files

SYNOPSIS
       dviselect [ -s ] [ -i infile ] [ -o outfile ] list of pages [ infile [ outfile ] ]

DESCRIPTION
       Dviselect selects pages from a DVI file produced by TeX, creating a new DVI file usable by
       any of the TeX conversion programs, or even by dviselect itself.

       A range is a string of the form even, odd, or first:last where both first and last are op-
       tional  numeric strings, with negative numbers indicated by a leading underscore character
       ``_''.  If both first and last are omitted, the colon may also be omitted, or may  be  re-
       placed  with an asterisk ``*''.  A page range is a list of ranges separated by periods.  A
       list of pages is described by a set of page ranges separated by commas and/or white space.

       Dviselect actually looks at the ten count variables that TeX writes; the  first  of  these
       (\count0) is the page number, with \count1 through \count9 having varied uses depending on
       which macro packages are in use.  (Typically \count1 might be a chapter  or  section  num-
       ber.)   A page is included in dviselect's output if all its \count values match any one of
       the ranges listed on the command line.  For example,  the  command  ``dviselect  *.1,35:''
       might  select  everything  in  chapter 1, as well as pages 35 and up.  ``dviselect 10:30''
       would select pages 10 through 30 (inclusive).  ``:43'' means everything up to and  includ-
       ing  page  43  (including  negative-numbered  pages).  To get all even-numbered pages, use
       ``even''; to get all odd-numbered pages, use ``odd''.  If a Table of Contents has negative
       page  numbers, ``:_1'' will select it.  Note that ``*'' must be quoted from the shell; the
       empty string is more convenient to use, if harder to read.

       Instead of \count values, dviselect can also select by ``absolute page number'', where the
       first  page  is  page 1, the second page 2, and so forth.  Absolute page numbers are indi-
       cated by a leading equal sign ``=''.  Ranges of absolute pages are also allowed:  ``dvise-
       lect =3:7'' will extract the third through seventh pages.  Dot separators are not legal in
       absolute ranges, and there are no negative absolute page  numbers.   Even/odd  specifiers,
       however,  are  legal; ``dviselect =even'' selects every other page, starting with the sec-
       ond.

       More precisely, an asterisk or an empty string implies no limit; an equal sign means abso-
       lute page number rather than \counts; a leading colon means everything up to and including
       the given page; a trailing colon means  everything  from  the  given  page  on;  the  word
       ``even''  means only even values shall be accepted; the word ``odd'' means only odd values
       shall be accepted; and a period indicates that the next \count  should  be  examined.   If
       fewer  than 10 ranges are specified, the remaining \counts are left unrestricted (that is,
       ``1:5'' and ``1:5.*'' are equivalent).  A single number n is treated as  if  it  were  the
       range  n:n.   An  arbitrary  number of page selectors may be given, separated by commas or
       whitespace; a page is selected if any of the selectors matches  its  \counts  or  absolute
       page number.

       Dviselect normally prints the page numbers of the pages selected; the -s option suppresses
       this.

AUTHOR
       Chris Torek, University of Maryland

SEE ALSO
       dviconcat(1), latex(1), tex(1)
       MC-TeX User's Guide
       The TeXbook

BUGS
       A leading ``-'' ought to be allowed for negative numbers, but it is currently  used  as  a
       synonym for ``:'', for backwards compatibility.

       Section  or  subsection  selection  will  sometimes  fail, for the DVI file lists only the
       \count values that were active when the page ended.  Clever macro packages  can  alleviate
       this  by  making  use  of other ``free'' \count registers.  Chapters normally begin on new
       pages, and do not suffer from this particular problem.

       The heuristic that decides which arguments are page selectors and which are file names  is
       often wrong.  Using shell redirection or the -i and -o options is safest.

       Dviselect does not adjust the parameters in the postamble; however, since these values are
       normally used only to size certain structures in the output conversion programs,  and  the
       parameters never need to be adjusted upward, this has not proven to be a problem.

                                                                                     DVISELECT(1)

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