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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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